Day 3 :
- Track 11: Material Processing; Track 12: Energy Processing; Track 14: Heat Transfer Systems; Track 10: Bioengineering and Bio-Mechanics; Track 16: Mechanical Engineering and Management
Session Introduction
Fuat OKUMUÅž
Gediz University
Turkey
Title: Investigation of the effect of tio2 on the thermal, mechanical and erosive properties of aviation thermoplastic composite
Time : 10:05-10:25
Biography:
Fuat OKUMUÅž has completed his PhD in the 1997 from Fırat University in Turkey and then , He has been full professor in the 2010. He has published more than 22 papers in reputed journals and conducted three projects which were supported by TÜBÄ°TAK(Turkey Science and Technology association).He have been performing to the main courses of machine engineering such as strength,statics,failure analysis,composite materials,mechanics of Composite materials,project managements. He is still in charge the director of Department of the Machine Engineering of The Gediz University.
Abstract:
The main goal of this study is to analyze the effect of increasing the amount of titanium dioxide (TiO2) particle filler in polyetherimide (PEI) thermoplastic composite materials, which are widely used in automotive and aircraft components. TiO2 generally improves the stiffness of the materials but reduces their erosion resistance, and filler concentration beyond 10 % impairs the bending strength. In the present study, variation of the bending, thermal, and solid-particle erosive wear properties of TiO2-reinforced PEI thermoplastic composites were investigated by changing the amount of TiO2 filler. The results confirmed that higher filler concentrations improved the bending strength of the composite structure, but decreased their erosion resistance. It was also found that the bending properties of the thermoplastic composite samples eroded at a 90 degree impingement angle remained nearly equal to those of the uneroded samples, whereas they were significantly reduced at a 30 degree impingement angle. We also determined the thermal stability of the composites using thermogravimetric analysis (TGA) methods.
Abdullah Altin
Van Yuzuncu Yıl University
Turkey
Title: A comparative study on optimization of machining parameters by turning nickel based super alloys according to taguchi method
Time : 10:25-10:45
Biography:
Abdullah Atin is an Assistant Professor Dr. in Van Vocational of Higher School Mechanical and Metal Tachnology Department, from Van Yuzuncu Yıl University in Turkey. His field of study is Manufacturing and Construction and has been working on CAD/CAM (Computer aid Design/Computer Aid Manufacture), Solid Edge, Master Cam and Production Technics. He has been in Germany Zittau- Gorlitz University, Mechanical Engineering department for research and access to training in CAD/CAM by Erasmus Project. And he has also been invited for teaching Staff Mobility By Erasmus Program to France, Nancy University of Lorraine, Mechanical Engineering Department in May 2013 and June 2014. Since 1996 he has been working at Yuzuncu Yıl University as a Lecturer and then as an Assistant Professor. Presently he is the Head of Department.
Abstract:
In this paper, the effects of cutting tool coating material and cutting speed on cutting forces and surface roughness were investigated on a Taguchi experimental design by turning Hastelloy X and Inconel 625. Main cutting force, Fz is considered to be cutting force as a criterion. The effects of machining parameters were investigated using Taguchi L18 orthogonal array. Optimal cutting conditions were determined using the signal-to-noise (S/N) ratio, which is calculated for average surface roughness and cutting force according to the "the smaller is better" approach. Using the results of analysis of variance (ANOVA) and signal-to–noise (S/N) ratio, effects of parameters of both average surface roughness and cutting forces were statistically investigated. It has seen that while feed rate and cutting speed has a higher effect on cutting force in Hastelloy X, the cutting tool and cutting speed has a higher effect on cutting force in Inconel 625 while the depth of cut and feed rate has a higher effect on average surface roughness on Hastelloy X, cutting speed and cutting tool has a higher effect on average surface roughness in Inconel 625.
Sunwoo Kim
University of Alaska Fairbanks
USA
Title: Optimum configuration for roadway embankment stabilization on permafrost using constructal law
Time : 10:45-11:05
Biography:
Sunwoo Kim received his Ph.D. degree in mechanical engineering and materials science from Duke University in 2008. Upon graduation he began his post-doctoral career, working as a research assistant professor at the University of Nevada, Reno. In 2010, he joined the Mechanical Engineering faculty of the University of Alaska, Fairbanks. His research interests are in a board spectrum of enhanced heat and mass transfer and renewable energy systems
Abstract:
Constructing surface facilities on the permafrost soils is an engineering challenge. Moreover, evading the thaw-settlement on roadway embankments is not an easy task due to the shifting thermal regime under the ground soil in accordance to the seasonal temperature variations. Out of all engineered cooling solutions available to stabilize the permafrost soil usage of thermosyphons has attracted many researchers through its outstanding results1compared to other cooling methods. The only limitation in using thermosyphons is of their high cost. In this research, optimization of thermosyphons is the primary goal. We are using Constructal law for this, which accounts for the universal tendency of freely morphing flow systems to generate configurations that evolve toward greater access for their currents. The areas of interest in the research is to compare the cooling effects and to find the optimal spacing between thermosyphons for both parallel evaporator and the bifurcated evaporator (T, Y and U sections), to find the ideal bifurcation level and analyze the cooling effects of different bifurcated level models.
Fan-Gang Tseng
National Tsing-Hua University
Taiwan
Title: Nano/Micro fluidic systems for circulating Tumor Cells (CTCs) rapid detection and diagnosis
Time : 11:20-11:40
Biography:
Tseng received his Ph.D. degree in mechanical engineering from UCLA, USA, in 1998. He is currently a professor of ESS Dept. as well as NEMS I., and the Deputy Director of the Biomedical Technology Research Center at NTHU. He was elected an ASME fellow in 2014. His research interests are in the fields of BioNEMS, Biosensors, Micro-Fluidics, Tissue Chips, and Fuel Cells. He received 60 patents, wrote 8 book chapters, published more than SCI 150 Journal papers and 360 conference technical papers. He received several awards, including National Innovation Award, Outstanding in research award, and Mr. Wu, Da-Yo Memorial Award from MOST, Taiwan, and eight best paper/poster awards.
Abstract:
Despite the recent advancement of biotechnology and pharmaceutical research, cancers remain the leading cause of human mortality. It is vital to diagnose cancers at an early stage when treatment can dramatically improve prognosis. So far, low-cost and easy to operate devices, which allow efficient isolation and sensitive detection of circulating tumor cells (CTCs) for routine blood screening, remain lacking. This talk will introduce a novel micro fluidic platform which can isolate CTCs from the real blood sample in 30 minutes: this system includes a high throughput blood cell separation chip which can separate white blood cells with CTCs from red blood cells and platelets by inertial and suction actions; a nano structured surface which can allow higher retention rate of CTCs on the surface for sample enrichment by 100 folds from 1/107 upto 1/105 CTCs/WBCs.ï¼›and the enriched sample will go through a final cells self-assembly process into a densed monolayer on a cell assembly chip for in parallel inspection at high speed. As a result, the CTCs can be identified in 30 minutes by the integration of these three chips altogether. Isolated CTCs will still be in vital and can be further characterized and cultivated for the identification of cancer stem cells for prognosis.
Wang Bin
Nanjing University of Aeronautics and
Astronautics
China
Title: Simulation research of driving schemes for a dynamic calibration system of fuel turbine flow meters
Time : 11:40-12:00
Biography:
Wang Bin is an lecturer at Jiangsu Province Key Laboratory of Aerospace Power System, College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics in China. He is a master tutor since 2010. He received his doctor’s degree from Zhejiang University in 2009 and his research area was hydraulic pumps. His postdoctoral research was done at the post-doctoral research station of aerospace science and technology from 2009 to 2012. Now his research interests are design and test of aviation hydraulic systems and components, especially aerospace auxiliaries like fuel pumps in aero-engines.
Abstract:
As one of the major parameters of fuel system in aero-engine tests, fuel flowrate is basically measured by turbine flowmeters(TFM). However, the meter coefficient would inevitably change due to the action of working medium, ambient condition or component wear. Regular calibration of the fuel TFMs must be carried out closely. Calibration can be essentially divided into static calibration and dynamic calibration. Because no dynamic calibration equipment and no corresponding appraisal procedure are applicable currently to these flowmeters used for a long time, confidence level for its dynamic measurement results is greatly affected and the practical demands for dynamic tests of high-maneuver aircrafts cannot be satisfied. In this work, a novel fuel hydraulic circuit is designed, in which a nozzle-flapper valve is adopted to generate a standard flow excitation, and the homologous driving schemes including the torque motor type and the piezoelectric stack type are given as the alternative solutions to drive the high-speed exciting valve. Based on a brief introduction of the calibration system principle, these two above-mentioned driving schemes are mathematically modelled and simulated using AMESim softwae tool respectively. Simulation results show that dynamic calibration system driven by piezoelectric-stack provides a faster and larger excitation flow than by the torque motor. In the mean time, the piezoelectric-stack driving scheme can ensure the reliable anti-electromagnetic interference (EMI) and control the flapper flutter more effectively.
Yang Rongfei
Nanjing University of Aeronautics and Astronautics
China
Title: Study on the penny platform of variable stator vane in compressor
Time : 12:00-12:20
Biography:
Rongfei Yang is a lecturer at Jiangsu Province Key Laboratory of Aerospace Power Systems, College of Energy and Power Engineering, Nangjing University of Aeronautics and Astronautics. She received her doctor’s degree from Beijing University of Aeronautics and Astronautics in 2011.Her research focuses mainly on unsteady flow phenomena in turbo-machinery including wake, tip leakage flow and their interaction with blade and shock. She also has been doing research in flow control in compressor or turbine such as variable stator vane,blade tip treatment to improve compressor or turbine performance.
Abstract:
Variable stator vane (VSV) is widely used in multistage compressors of gas turbines, which can improve the compressor performance at off-design conditions. The gap between the vane ends and the casing or hub of the compressor should be enough large to ensure the reliable vane rotation, so effects on the compressor performance cannot be ignored. Due to the plugged part of the gap, location and size of the adopted and the effects of penny platform location on performance of 2-D cascade are studied through experiment and numerical simulation. The penny platform is processed to match blade profile at one end of each vane. Numerical calculation of the annular cascade with cylindrical penny platform is carried out, in which the penny platforms at opposite ends of the vane are given the different location and size. Results show that the loss of cascade at large attack can reach the minimum level when the penny platform occupies the front half blade and covers the leading edge of the blade. At the same time, the penny platform should be large enough to block up the high load zone of the blade. The end wall loss is greater near the casing than near the hub.
Ahmet Ermeydan
Anadolu University
Turkey
Title: Flight control of a UAV using fuzzy gain–scheduled PID
Time : 12:20-12:40
Biography:
Ahmet Ermeydan is a research assistant at Anadolu University, Faculty of Aeronautics and Astronautics in Turkey. He received his master degree in the area of fault tolerant control of quadcopters from Anadolu University in 2015. His research field includes aircraft design, flight control and fault tolerant control.
Abstract:
In this study, flight control of Pioneer Unmanned Aerial Vehicle (UAV) is presented based on fuzzy gain-scheduled PID controller. Pioneer UAV is stabilized with four control subsystems which are airspeed, altitude, yaw rate and heading controllers. Airspeed subsystem uses only airspeed as feedback to the controller and its output is limited by 350 N thrust and time constant of 0.25 s. Remaining actuators including ailerons, elevator and rudder are also limited by position of ±30 deg, rate of 150 deg/s and time constant of 0.1 s. Altitude subsystem consists of three cascade loops for pitch rate, pitch angle and height control of the UAV. In the same way, heading subsystem has three loops for roll rate, roll angle and heading control of the aircraft. Cascade control system design provides some good characteristics in flight control such as disturbance rejection and better damping and stability. Performance of classic PID and Fuzzy-PID controllers designed for airspeed, altitude and heading are compared based on time response specifications utilizing MATLAB/Simulink environment. Only outer loops are included in the comparison of the system. Although there is not much difference between the controllers commanding airspeed from 60 m/s to 50 m/s, Fuzzy-PID is more robust than conventional PID in the beginning of the simulation. Altitude Fuzzy-PID response of the UAV gives a better tracking performance than classic PID taking into account the transient response characteristics of the system. Finally, Fuzzy-PID gives a faster response than classic PID with less overshoot in heading control of the aircraft. To sum up, results show that changing controller gains dynamically exhibits a better performance than fixed gain values.
Lu Jia
Taiyuan University of Science and Technology
China
Title: The research on technological parameters of short forming process of ring parts
Time : 12:40-13:00
Biography:
Lu Jia has became a PhD candidate at the age of 25 years in TaiYuan University of Science and Technology in 2014, majored in materials science and engineering. She has published more than 5 papers in reputed journals and 4 patents in CPB .
Abstract:
As essential basal spare part of contemporary mechanical device, ring parts have found wide application in the fields of aviation and space and other industrial. The existing production process of ring parts has exposed many disadvantages such as serious waste of material, energy consuming, long production cycle and un-ideal production quality. The object of this study is to introduce a new short ring processing, which make use of the remained heat of casting to hot rolling directly. Take 42CrMo alloy steel as an example in the research, the technological parameters in the ring processing was investigated by means of experiment research and numerical simulation. The smelting temperature is 1700℃, the casting temperature, depanning temperature and initial temperature of mold are 1520℃, 1050℃, 2000℃, respectively, and spinning rate of the mold in the casting is 6.7r/s The heat preservation temperature and the soaking time in heating process are 1050℃ and 30 minutes respectively, then persistent overheating at the rate of 5℃ per minute to 1150℃ and keep for 5minutes. The initial rolling temperature is 1150℃, the rolling rate is 2 and the range of mandrel roller feeding speed is 0.35mm/s to 2.57mm/s. These parameters offered important reference value for technology research and development in short process, and also promoted the application in short process of plastic forming.
Hamza Alsalla
Exeter University
UK
Title: Effect of different building direction on fracture toughness of ultra high strength aerospace components made by additive manufacturing
Time : 13:00-13:20
Biography:
Hamza Alsalla has got a high diploma in renewable energy and mechanical engineering from the academy of graduate studies, Libya and he has received his master degree in Aerospace materials from Sheffield University, department of material science and engineering, United Kingdom since 2012. Also he has started his PhD since September 2013 at the University of Exeter, College of Engineering, Mathematics and Physical Science. He is a lecture in the Technology College of Civil Aviation and Meteorology, Sbeah-Libya and Demonstrate Tutorial in mechanics at Exeter University. He is Ex-lecture in Alzzaytouna University –Libya. His research interest are in aerospace material and mechanical engineering.
Abstract:
Direct Metal Laser Sintering (DMLS) and Selective Laser Melting (SLM) are an Additive Manufacturing (AM) technique that produces complex three- dimensional parts by adding layer up on layer of powder materials from bottom to top. Recently, AM has received large amount of press and is set to have a large impact such as decreasing the cost of production, fast and flexible, design freedom, increase the innovation opportunities and develop new materials system for the consumption of Aerospace industries. Since the major problems come across in the process is limited surface quality, and residual porosity in SLM and DMLS parts may be undesirable for some applications where fatigue resistance and high strength are essential. This research aims to improve the fracture toughness, ductility and fatigue life for the metallic components, which is essential to entirely exploit potential of the SLM and DMLS of these alloys for aerospace applications. The development in the Additive Manufacturing technology is not only limited to new machines and new materials and methods but also new processes, to offer high mechanical properties and performance. This research focus on DMLS and SLM of Titanium and Stainless steel alloys to investigate the effect of different building direction on strength, ductility and fracture toughness property. This investigation may create a strong need for a system that could contribution in the selection of the possible process chains, materials and finishing options and may extend the capability of AM process to generate high performance component for commercial application in aerospace industries.
Biography:
Mohammadreza khani has completed his Ph.D at the age of 40 years from Teharan resaerch and sciences branch of IAU. He is the head of water purification research center of IAUTMU. He has published more than 45 papers in international and national journals and has been authorizing more thao 40 books in environmental health engineering.
Abstract:
The cistern under investigation supplied cold drinking water for the local community in old days when city water distribution system and mechanical refrigeration systems were not available. Long-term underground cold-water cisterns had been used in the hot and arid regions. These cisterns provide cold drinking water during warm seasons for local communities. In this paper, the thermal performance of an underground cold-water cistern during the withdrawal cycles in warm seasons is investigated. The cistern is located in the central region the city of Yazd. The results show a stable thermal stratification in the cistern throughout the withdrawal cycle. The thermal stratification has different position in up and down of cistern. In the upper of surface cistern the thermal is different, because of several factors such as: thermal exchange among the upper layers of water and the domed roof, transfer of mass and evaporation due to entry air from the wind towers.
Biography:
Shuh Jing Ying graduated from Provincial Shao-Hing High School. Because of the World War II, he was in military service graduating through Chinese Air Force Technology Institute. He served 4 years in the Engine Overhaul Factory in Taiwan China as a Lieutenant, and then he entered National Cheng-Kung University, Majored in mechanical engineering. He, in 1958, completed MSc at Brown University and PhD at Harvard University in 1966. He received Outstanding Faculty Award in 1975, Engineer of Year Award in 1985, elected as Fellow of American Society of Mechanical Engineers in 1995, and published a text book ‘Advanced Dynamics’ in 1997. He retired in the year of 2000 and earned a title of Emeritus Professor. He is currently working in a part-time job in the University of South Florida.
Abstract:
Wheelchair scale is available, but is usually of floor type and huge in size. Our scale is aimed to be similar to the bathroom scale, portable and inexpensive. The maximum capacity of the common bathroom scale is 440 lbs. Because the weight of the wheelchair is about 200 to 300 lbs and the weight of a patient could be 120 to 300 lbs. So the capacity of a wheelchair scale should be about 600 lbs. This figure is just above the maximum limit of the bathroom scale. Therefore, we need to build one by ourselves. The design of the wheelchair scale is similar to bathroom scale but bigger is size and higher in capacity. But to our surprise no schematic diagram can be found in the computer internet. And it is difficult to figure out the circuit from the existing scale, because it is in printed circuit board. However, the whole device is simple so we started from scratch. We use strain gage as the sensor, NPN transistor as the power supply for constant current. Then the signal is amplified and the analogue output is converted to BCD signal and BCD signal is converted to 7-segments code for LED display. In the whole paper, the detailed schematic diagram is included. Also because the audience in the conference is not all in electric engineering, so some additional explanations will be provided for binary, BCD and 7-segments code etc. To find those parts from electronic supply companies is another challenge to us but they are found. The device is built and the picture is attached. The accuracy of the scale is set that at 450 lbs the error is zero. Away from 450 lbs the error increasing gradually depends on the linearity of the strain gages. Exact error chart and the procedure to reach to this accuracy will be given in the paper.
Jonny Carlos da Silva
Federal University of Santa Catarina (UFSC), Brazil
Title: Design for reliability of mechatronic systems supported by knowledge-based systems in design process early phases
Time : 14:40-15:00
Biography:
Jonny Carlos da Silva has completed his DE and is a Professor at UFSC, Brazil. He has worked as Post-Doc Researcher at NASA Ames Research Center. He has more than 50 papers on design and knowledge-based systems. He is the Co-Author of a book on integrated product design. He is also a Master Coach and Speaker.
Abstract:
Mechatronic devices integrated with control systems are fundamental to safe operational condition of complex vehicles, especially aircrafts. In order to ensure reliability of aircraft mechatronic systems, with consequent improvement in safety, it is necessary to pay special attention to failures in these devices and their consequences in other sub-systems from the early design phases. An important element to consider is the electromagnetic compatibility, which deals with electrical and magnetic relations among components or between sub-systems operating in the same electromagnetic environment that may produce interference and malfunction. This paper presents a literature review on fault analysis in mechatronic and electronic control systems caused by electromagnetic problems, followed by the description of a Knowledge-Based System (KBS) prototype for the early design phases focused on electromagnetic compatibility and reliability of mechatronic systems. The prototype includes a knowledge base on mechatronic design. Rules, object-oriented modeling and semantic networks are implemented as knowledge representation techniques. Results are evaluated and discussed by experts in mechatronics and design. The paper also discusses issues on expandability and validation of KBS prototype.
Chol-Bum ‘Mike’ Kweon
US Army Research Laboratory
USA
Title: Unmanned Aerial System (UAS) engine research at US Army research laboratory
Biography:
Chol-Bum ‘Mike’ Kweon completed his PhD from University of Wisconsin-Madison in 2002. He worked for Gas Technology Institute, General Motors R&D, General Motors Powertrain, and Delphi Advanced Powertrain. He is the Team Leader of Power Generation Research Team at the US Army Research Laboratory. He has published more than 60 technical and journal papers and 31 intellectual properties. He teaches a graduate-level combustion course at Johns Hopkins University and an undergraduate Internal Combustion Engine class at University of Maryland-College Park. He also serves as a Technical POC and Committee Member in multiple DoD organizations and technical communities.
Abstract:
Demand for Unmanned Aerial Systems (UAS) aircrafts is projected to increase dramatically in the near future. U.S. Army has four major UAS aircrafts with varying propulsion technologies from battery, rotary, to diesel engines. Selection of the technologies is currently based on the power range: small UAS powered with battery, medium UAS with aviation gasoline powered rotary engine (28 kW), and large UAS with Jet fuel powered diesel engine (119 kW). Each technology has its own issues with a common issue of reliability. The major issue of the battery-powered UAS aircraft is its weight and flight time with a huge burden on soldiers who need to carry the battery system. Rotary engine technology has its inherent seal issues due to its large contact areas, and it is difficult to efficiently burn heavy fuels due to its inherent low compression ratio. The diesel engine version is the most reliable but it still has significant reliability issues. One of the major issues may be induced due to large fuel property variation of Jet fuels. For instance, Cetane number of Jet fuels varies from as low as 30 to over 50 in the battlefields which will have significant impact on ignition and combustion processes of UAS aircrafts at high altitudes. Abnormal combustion could lead to detonation which could damage the engines and lead to loss of aircrafts. In this presentation, the effects of fuel properties on UAS engine combustion will be presented. In addition, spray and combustion processes of different fuel properties will be presented both in experiment and 3D CFD.
Khalil Khanafer
Australian College of Kuwait
Kuwait
Title: Computational study of hemodynamic effect of false lumen partial thrombosis of type b aortic dissection for various tear size and configuration
Time : 15:20-15:40
Biography:
Khalil Khanafer has completed his PhD in Mechanical Engineering from Ohio State University. He has several years of experience in modeling thermal and biomedical applications. He is the head of Mechanical Engineering Department at Australian College of Kuwait. He has published more than 40 peer-reviewed journals and has been serving as an Associate Editors for Journal of Porous media and Special Topics & Reviews in Porous Media: An International Journal, and in the editorial board of Annals of Vascular Surgery.
Abstract:
The aim of this investigation is to study numerically the hemodynamic effect of false lumen partial thrombosis of an aortic dissection for various tear size and configuration. The numerical model will be validated against the experimental results from a bench-top-model in the absence of thrombus. Various numerical meshes will be constructed using a finite-volume based Computational Fluid Dynamics (CFD) solver (ANSYS Fluent 15) to simulate pulsatile flow and pressure in dissected aorta models. The Shear Stress Transport (SST) turbulence model will be imbedded. All simulations will be carried out for enough cardiac cycles to achieve a periodic solution, and the results obtained in the last cycle will be used in the validation. The effect of false lumen partial thrombosis for various tear size and configuration will be presented in this investigation. We anticipate that the presence of thrombus will affect significantly the pressure difference between the false lumen and true lumen as well as the flow pattern and wall stresses.
Gholamhossein Liaghat
Tarbiat Modares University
Iran
Title: Impact behavior of syntactic foam core sandwich panels
Time : 15:40–16:00
Biography:
Gholamhossein Liaghat has completed his PhD at the age of 29 years (25 years ago) from University of Manchester Institute of science and technology (UMIST), UK and postdoctoral studies from Manchester University. He is professor of mechanical engineering and the director of Impact Mechanics Research Group and Laboratory at Tarbiat Modares University Tehran, Iran and currently visiting professor at Kingston University, London, UK. He has published more than 110 papers in international journals and conferences and serving as an editorial board member of IJCM.
Abstract:
In this study the impact behavior of sandwich panels with syntactic foam core was experimentally investigated. The sandwich panels were similar in facing of woven fabric glass fiber / epoxy matrix composite laminates and with six different types of epoxy based syntactic foams as core. The syntactic foams filled with ceramic microballoons of 0.1 thickness ratio and effective density of 0.7 kg/m3 with three different sizes (80, 130, and180 micron) and three different volume fractions (20 ,40 and 60 percent). The fabricated specimens were tested with a ballistic gas-gun using a light blunt steel projectile. The ballistic limit velocities were measured carefully and the damage mechanisms that absorb energy during the perforation process were considered by exploring the damages of specimens. Although the results showed that with increasing the volume fraction of microballoons the ballistic limit decreases but the panel with 40 % volume fraction of microballoons had the most specific perforation energy. Also, the results indicated that the impact resistance of the panels with syntactic foam core of smaller microballoons became more. A large number of experimental results were presented, compared, discussed and commented upon.
Kambiz Vafai
University of California, Riverside
USA
Title: The anomalous behavior of nano fluids thermal properties: Do we really have an answer for this dilemma?
Biography:
Kambiz Vafai has authored over 300 journal publications, book chapters and symposium volumes. He is a Fellow of ASME, AAAS, Associate Fellow of AIAA and is the distinguished Professor of Mechanical Engineering at the University of California, Riverside, where he started as the Presidential Chair. He had received the 2006 ASME Memorial Award and the InterPore’s Highest Award (2011) and the ASME Classic paper award (1999) and is amongst the ISI highly cited scientists. He holds 12 US patents. His latest book which he has edited is entitled “Handbook of Porous Media-Third Edition†which is published by CRC/Taylor & Francis.
Abstract:
A large number of research work related to the heat transfer enhancement using nanofluids both experimentally and theoretically was conducted by a number of investigators. Although various studies have shown that nanofluids illustrate higher heat transfer enhancement than those of base fluids, contradictory results on nanofluids behavior were also reported. Many researchers observed the phenomenon of higher thermal conductivity of various nanofluids compared to that of the base fluids. However, differences between the results were observed, i.e., some showed that the increase of thermal conductivity of nanofluids is an anomaly that cannot be predicted by the existing conventional equation; while some others showed that the increase is not an anomaly and can be predicted by using the existing conventional equation. Recently, a number of studies showed superior thermal conductivity of grapheme (single two-dimensional layer of carbon atoms bound in a hexagonal lattice structure) much higher than the value observed in all other materials (> 5000 W•m−1•K−1). This value should be verified since the measurements at the atomic scale may exhibit a large error when determining the temperature gradient across the atomic layer. While many studies in literature have reported enhanced effective thermal conductivity of nanofluids, specific heat capacity measurements have shown controversial results. The effects of temperature and nanoparticles volume fraction on the specific heat capacity of conventional nanofluids are in agreement in all studies cited in this study. Disagreement was reported for the results of the specific heat capacity of molten salt-based nanofluids. A number of studies showed an enhancement in the specific heat capacity of nanofluids using 1% concentration of nanoparticles by weight only. However, other studies have shown deterioration in the specific heat capacity of nanofluids compared with the base mixture using various volume concentrations of nanoparticles. Therefore, additional theoretical and experimental research studies are required to clarify the mechanisms responsible for specific heat capacity enhancement or deterioration in nanofluids.
Debao Zhou
University of Minnesota
USA
Title: Design of a constant-voltage-source to array of sensors to optimize heart-beat detection
Biography:
Debao Zhou is an Associate Professor in the Department of Mechanical and Industrial Engineering at the University of Minnesota Duluth (UMD). He joined UMD as an assistant professor in 2009. Prior to this, he was a McKnight professor in the Department of Electrical Engineering at UMD. From 2005 to 2008, he was with Georgia Institute of Technology as a Postdoctoral fellow. He received his Ph.D. degree in Mechanical and Production Engineering in Nanyang Technological University, Singapore in 2004. He also earned an M.Eng. degree and a B.Eng. degree from Tsinghua University, P. R. China all in Mechanical Engineering.
Abstract:
This work presents the design of a circuit to capture the signal from the skin-like heart beat sensor and convert it to an electrical signal. The circuit is one part of the optical heart beat detection system which also includes the skin-like optical sensor array and the laser source and data processing unit. The circuit will be connected with the sensor array and be able to detect the sensing signal at each element of the array. The sensor system could also be applied to contact form detection in other biomedical system. The sensing element of the sensor system is realized through the measurement of the change of the resistance. The circuit will power the circuit with a sequence of pulses and the output is distinguishable corresponding to each pulse. The circuit can handle single input and multiple outputs. Testing results showed that the prototype of our circuit built on a breadboard can meet the design criteria with the defect of non-zero offset at the output when the circuit is not powered. Based on the breadboard circuit, the final circuit will be fabricated through CMOS technology on 3mm×3mm silicon chip in order to accommodate the real application of the sensor.
Evgeny A. Demekhin
Laboratory of Electro-Hydrodynamics
Financial University
Title: Nano-scale electro kinetics in one- and two-phase flows: instabilities, bifurcations, and patter formation
Biography:
Evgeny Demekhin received his Ph.D. in Physics and Mathematics from Moscow State University and postdoctoral studies from Institute of Thermophysics, Siberian Branch of Russian Academy of Science. He worked as a Visiting Professor at the University of Notre Dame, MIT, West Virginia University, Morgantown, the Bordeaux University, France, Instituto Pluridisciplinar, Madrid, EPSRC Visiting Fellow at Leeds University, England. He is a Director of the Laboratory of Electro-Hydrodynamics of Micro- and Nanoscales in the Financial University, Moscow. He has published 142 papers and one monograph.
Abstract:
The advent of micro-, nano- and biotechnologies in the last decade has spurred numerous new and active research areas, in particular, problems of electrokinetics. Other than the practical importance of these effects is a theoretical interest to these problems: study of the space charge in the electric double-ion layer is a fundamental problem of modern physics, first addressed by Helmholtz. We shall focus on an often-ignored phenomenon: the underlying very rich hydromechanics. The relevant hydrodynamics involves micro-scale vortices, vortex instabilities and even turbulence like eddy fluctuations whose vortex pairing dynamics create a range of vortex sizes, all at miniscule Reynolds numbers. Singularities, instabilities, turbulence, continuum of length scales, self-similar solution, vortex pairing etc are among the investigated phenomena. Despite of their micro and nano length scales, these instabilities and bifurcations exhibit all the hall marks of other classical hydrodynamic instabilities – a subharmonic cascade, wide-band fluctuation spectrum and coherent-structure dominated spatio-temporal dynamics. We shall present our results for the one-phase electrokinetic instability near charge-selective surfaces, influence to this instability of the surface profile, the effect of a coupling between electrokinetic phenomena and the surface hydrophobicity, Joule heating, geometric confinement etc. Unstable two-phase liquid-gas flows with a mobile surface charge finalize our investigation. The problems are studied from the viewpoint of hydrodynamic stability and bifurcation theory using sophisticated asymptotic methods and direct numerical simulations.
Biography:
Maryam Shafahi received her PhD at Mechanical Engineering from University of California, Riverside at 2010. She has published 7 papers in reputed journals and has been serving as an editorial board member for different journals such as International Journal of Heat and Mass Transfer, ASME Journal of Heat Transfer and Heat Transfer Engineering.
Abstract:
Heat pipes and their applications in thermal management have been studied for decades. They are efficient, compact tools to dissipate substantial amount of heat from various engineering systems. Heat pipes are able to dissipate substantial amount of heat with a small temperature drop along their length while providing a self-pumping ability. Nanofluid heat pipes utilize nanofluid as their working fluid. Nanofluids are a relatively new class of fluids which consist of a base fluid with nano-sized particles (1–100 nm) suspended within them. These particles, generally a metal or metal oxide, alter thermal conductivity of the fluids allowing them to transfer more heat. Nevertheless, addition of nanoparticle to the base fluid increases their density and viscosity which causes more pressure drop along the heat pipe. Based on the published work of the first author, there is an optimum concentration of nanoparticles within the base fluid to exploit the maximum heat transfer in the heat pipe. The purpose of the current work is to verify the previous findings of mathematical model with experimental data. Almost all the research on the use of nanoparticles in heat pipes is either obtained by merely experimental or mathematical models. To the best of authors’ knowledge; there is a lack of information on heat pipe characteristics in the presence of a nanofluid based on a model supported by experimental data. In this work, the influence of nanofluid on the heat pipe thermal performance is studied using a mathematical analytical model supported with experimental data. The nanofluid utilized as the working fluid is Al2O3 (Alumina) mixed with water. The changes in velocity, pressure, maximum heat, and thermal resistance of the two phases in a cylindrical heat pipe are studied using Alumina nanoparticles with water as the working fluid. The expected results of the experimental model are to verify the increase in thermal conductivity, pressure drop of the liquid phase and maximum heat transfer for the nanofluid heat pipe compared to conventional cylindrical heat pipe with the same size. As a result, there will be an improvement in thermal resistance of the heat pipe using nanofluid which allows a noticeable reduction in the heat pipe size while transferring a large amount of heat with negligible temperature drop. This feature of the nanofluid heat pipe nominates this devise as a new significantly efficient heat remover for several applications in electronic cooling, aerospace and biomedical industry.
El-Sayed M. Sherif
King Saud University
Saudi Arabia
Title: Effect of carbon content on the corrosion of aluminum-titanium carbide alloy in 3.5 wt.% sodium chloride solutions
Biography:
Prof. Sherif has been appointed Professor in the Center of Excellence for Research in Engineering Materials (CEREM) at KSU. He assumed his duties in October 2008. Prior to joining KSU, Prof. Sherif has been holding a Professor position at the National Research Centre (NRC), Cairo, Egypt. He has previously held the positions of Associate Professor, Researcher, Researcher Assistant, and Assistant Researcher at NRC from 1994 till 2002. On Feb. 2004 and for a complete year, he served as a Postdoctoral Fellow for Pohang University of Science and Technology (POSTECH), South Korea. Prof. Sherif also spent three other years (Sept. 2005 to Sept. 2008) as a Postdoctoral Fellow for the University of the Witwatersrand (WITS), Johannesburg, South Africa. Prof. Sherif has more than 90 ISI papers, a book chapter, and attended more than 20 international conferences.
Abstract:
Three aluminum-titanium carbide (Al-TiC) alloys were manufactured using mechanical alloying technique at 1300 ºC as sintering temperature. The effect of increasing the carbon content on the corrosion of these alloys in 3.5% NaCl solutions was investigated using cyclic potentiodynamic polarization, chronoamperometric current-time, open-circuit potential, and electrochemical impedance spectroscopy measurements. The surface of the alloys after their corrosion in the test solution was investigated using scanning electron microscopy investigations. All results were consistent with each other and confirmed clearly that the corrosion resistance of Al alloys remarkably increased with increasing the carbon content.
S.Y. Marzouk
Arab Academy for Science and Technology
Egypt
Title: Power extraction experimentally from regular wave using the wave hunter system
Biography:
S.Y. Marzouk is a Professor and head department of basic and applied science, Feb 2012 – till now faculty of engineering and Technology, Arab Academy of Science and Technology. He had award of Promoting scientific of National Research Centre 2008 about Solid state physics. He had obtained seven awards for distinctive researches and published in international scientific periodicals from Arab Academy of Science and Technology,2010-2011 for all papers in solid state physics and material science.
Abstract:
The most critical problem that faces the modernization and development of any country is the energy crisis. This issue is strongly appeared in the last decades due to the rise in fossil fuel price and environmental impact of combustion. The world will need new energy supplies and an upgraded energy infrastructure to meet the growing demands for electric power and transportation fuels. For this situation, much clean energy is expected to blossom for satisfy the energy amount for this civilization, which is inflating. Wave energy is one of the green energy available annually and has enormous energy stored. However, the problem is that type of energy has not been effectively used so far. A new design is introduced to the wave energy conversion system to produce power from regular and irregular waves. This system is called WAVE HUNTER. Furthermore, the results introduce the experimental testing evaluation of this system with some innovative float shapes in water tank.
Biography:
Asiful Hossain Seikh is an experienced result oriented Researcher with a professional background comprising 18years of research, technical and supervisory experience in materials, corrosion, mechanical, chemical and metallurgy engineering. His areas of technical experience include materials/polymer research and testing, failure analysis, materials specification and selection, corrosion control and monitoring, paints and coating evaluation, inhibitor evaluation and chemical treatment. Dr. Seikh has completed his Bachelor degree (1994) in Materials & Metallurgy from National Institute of Technology, Durgapur, India and Master (1997) & PhD (2005) in Materials & Metallurgical Engineering from Jadavpur University, Kolkata, India. During his professional career in KACST (2003-2005), Riyadh, KSA, UAE University (2005-2010), Al Ain, UAE and King Saud University (2011-Present), he has been involved in a number of research and industrial projects related to corrosion and metallurgy. Based on the results of his research work, a number of research papers (17 Journal & 6 Conference) have been published.
Abstract:
In this study, nanocrystalline aluminium alloy were produced from metallic powders with addition of 10wt. %Fe and 5wt. %Cr processed using mechanical alloying (MA) technique. The initial powders were processed in a planetary ball mill for 150 hours at room temperature in an inert atmosphere. The processed powders were consolidated and sintered using a high frequency induction heat sintering (HFIHS) machine to form bulk samples. The consolidation pressure, heating rate, temperature and time of sintering will be 50MPa, 823K/min, 823K, 6minutes, respectively. The crystallize size of the bulk samples was calculated from the peak profile obtained through X-Ray diffraction (XRD). The corrosion resistance of nanocrystalline aluminium alloy was studied in 3.5% NaCl solution at room and higher temperatures using electrochemical impedance spectroscopy (EIS) and linear polarization resistance (LPR) techniques. Linear polarization resistance curves, Nyquist data and Bode curves obtained by electrochemical impedance spectroscopy, suggest that the alloy have good resistance to corrosion in sodium chloride solution at room temperature as well as at higher temperatures.
Emin AÇIKKALP
Anadolu University
Turkey
Title: The energy of lift during climb and cruise for different engine types
Biography:
Emin AÇIKKALP is a Assistant Professor in the Department of Mechanical and Manufacturing Engineering . He received his BSc in 2004 from Mechanical Engineering Department at Osmangazi University, Turkey and PhD in 2013 from Graduate School of Sciences at Osmangazi University, Turkey. His research areas are energy, exergy and exergoenvironmetal analysis, advanced exergy based analysis, finite time thermodynamics, renewable energy, statistical thermodynamics, quantum thermodynamics and entransy analysis.
Abstract:
In this study, energy of lift has been calculated for five different hypothetical aircraft engine types in two condition, i- cruise at 8,000ft (2,440m) and ii- climbing at the sea level. Energy analysis is a powerful tool to provide the effective use of energy and to decrease environmental impacts caused by aircrafts as well as other systems. Energy destructions have occurred mostly at the engine components both at the climbing and the cruise conditions. In addition, wings and propellers are the second and third components, respectively, in terms of energy destruction. The less energy of lift was found in the higher aspect ratio of aircraft. The biggest energy destruction rate is equal to 32 kW approximately in the engine that has the second big size. The engine having the biggest power has the maximum energy destruction rate, 473 kW, while climb conditions. As a result of this study, it is concluded that the engines with higher power and fuel mass flow rate have bigger energy destruction rates within their components in terms of the energy of lift; 316 kW destruction in the engine component, 77 kW destruction in the wing component, 25 destruction kW in the propeller component for O-540-J3C5D engine which has 175 kW power.
Esam M. Alawadhi
Kuwait University
Kuwait
Title: An experimental study on heat gain in window with an external shutter
Biography:
Esam Alawadhi is the professor of Mechanical Engineering at Kuwait University. He earned his Doctor of Philosophy (May 2001) in Mechanical Engineering from Carnegie Mellon University, USA. His research focuses on the renewable energy, thermal management of electronics devices, energy conservation for buildings, fluid flow stability, and phase change heat transfer.
Abstract:
Windows are account for the majority of the heat gain in buildings, and to reduce the heat gain, exterior shutters are commonly installed in residential buildings in hot climates. The shutter is typically incompletely close during the daytime to have indoor natural lighting, which potentially reducing the thermal effectiveness of the shutter. Since there is temperature difference between the window glass and shutter, natural convection flow in induced in the space between the window and shutter. Experimental measurements are employed to study the effect of the shatter on the heat gain through the window during the month of June. The results indicate that when the shutter is incompletely closed, the heat gain through window can be increased by 44.5%, depending on the shutter opening distance.
A.Ramadan
Arab Academy for Science and Technology
Egypt
Title: Captured power from irregular wave using the inverted cup float
Biography:
A.Ramadan has completed his Ph.D the age of 35 years from Helwan University Faculty of Engineering after finishing the scholarship period from DAAD. He studied at Institute for Fluid Dynamics and Ship Theory (FDS) of Hamburg University of Technology (TUHH), in the field of wave energy conversion system.Mr. Ramadan is lecturer in the basic science department - College of Engineering and Technology, Arab Academy for Science and Technology and Maritime Transport (AAST) Cairo. Mr. Ramadan has published 4 papers in international conferences and journal and 2 papers under review.
Abstract:
The growing number of the population and increasing rate of well-being with a decrease in the energy resources required are the major problems must be faced now. However, consumption of fossil fuels has become a destructive force. Locally that is because of emissions, spills and leaks pollutants' dispersion, acid rains, global warming, climate changes, sea level rise as well as strip mining. The most appropriate solution to meet the energy deficit is the search for alternative sources of renewable energy and uses it as an alternative to fossil fuels for the production of electricity. Wave energy is one of the green energy available annually and has enormous energy stored. However, the problem is that type of energy has not been effectively used so far. A new design is introduced to the wave energy conversion system to produce power from regular and irregular waves, further more testing this system with some innovative float shapes in water tank.
Onder ALTUNTAS
Anadolu University
Turkey
Title: Determination of energetic and exergetic losses in cylinders for piston-prop aircraft engines
Biography:
Onder ALTUNTAS is a Assistant Professor in the Faculty of Aeronautics and Astronautics. He has graduated from the School of Civil Aviation at Anadolu University, Turkey in the year of 2004. He received his PhD from Graduate School of Sciences at Anadolu University, Turkey in 2011. He has published several articles and papers about energy, exergy and exergoenvironmetal analysis and their aircraft applications, especially piston-prop aircrafts. He is still the Assistant Manager of Applied Research Center for Civil Aviation at Anadolu University.
Abstract:
In this study, energy and exergy losses of around piston-prop aircraft engine –naturally aspirated, opposite, four cylinders and air–cooled and 360 in3 cylinder displacement– cylinders in the taxi phase are investigated. The taxi phase is part of the landing and take-off (LTO) phase and about three-fifths of the total LTO phase. A wide range of applications was considered in the calculations. While the duration of the taxi-out, a stage of before the take-off, was measured to be 6m30s, the duration of the taxi-in, a stage of after the landing, was measured to be 5m18s. The remaining phase, the rest of the LTO and cruise, was 1h50m. The outside air temperatures in the taxi-out, and taxi-in were 15.76 ºC and 21.46 ºC, respectively. Under these conditions, the maximum energy and exergy loss rates were calculated 13.39 kW and 3.85 kW for the second cylinder in the taxi-in, while the minimum energy and exergy loss rates were obtained to be 12.85 kW and 3.45 kW for the third cylinder in the taxi-out, respectively. The maximum energy and exergy efficiencies were determined to be 19.96% and 14.63% in the taxi-in, respectively.
Amal Al Ghaferi
Masdar Institute of Science and Technology
UAE
Title: Real-time graphene based scale monitoring smart sensor systems
Biography:
Amal Al Ghaferi is the first National Faculty member at Masdar Institute of Science and Technology. She is an Assistant Professor at the Materials Science and Engineering program. She got her PhD in Materials Science and Engineering from University of Pittsburgh, Pa, USA. She got a 2009 UK Prime Minister’s Initiative award, PMI2, which is a Research Co-operation Funding program between UK and UAE, and she got the 2009 Women in Science and Technology Fellowship from US Department of state . In additional to that, Dr. Al Ghaferi won two of Sheikh Rashid Scientific Distinction Awards one in 2000 and the other in 2007. Dr. Al Ghaferi research interest is in Nanotechnology and how to implement the nanomaterials in potential applications for UAE. Dr. Al Ghaferi had more than 20 publications in this field. Prior joining Masdar Insatiate of Science and Technology, Dr. Al Ghaferi was an assistant Professor at the Physics Department at UAE University in Al Ain, where she got her academic experience in teaching fundamental and advance courses in Physics. Teaching and interacting with students had inspired Dr. Al Ghaferi to support women in the field of Science and Engineering in Middle East. Dr. Al Ghaferi has great interest in Women in Science. She was the organizer of Women in Science workshop at Masdar Institute in 2010 with US Department of State and University of Michigan Dearborn. Also she had played important role in organizing The Clean Energy Education and Empowerment (C3E) women's initiative which was part of the 2nd clean energy ministerial meeting in Abu Dhabi.
Abstract:
The scale deposition at the internal surface of the pipelines under the supersaturation conditions leads to unavoidable damage of the equipment parts. Consequently, suspension of oil operations becomes essential in order to replace the damaged parts. Such interruptions are escorted by extremely high costs. In this project the sensitivity and selectivity of carbon nanomaterials (CNMs) to detect scale in oil and gas pipelines is the main goal. Two different methods will be investigated to fabricate sensors that can detect the presence of any new molecule at the surface of CNTs. These sensors can be used as chemical and gaseous sensors that can function in the oil and gas industry’s hostile environments. The first method of making the sensors is the smear casting technique. In this method CNT are dispersed in a polymer matrix (epoxy) using ultra high sonicator. This technique provides strong nanocomposites with electrical properties that responds to changes in chemical composition at its surface. The second technique is using CNTs ink and printing of CNT films using inkjets, which after curing do the same function that casted CNTs can do
Elguja Medzmariashvili
Georgian Technical University
Gerogia
Title: Main directions in transformable engineering structures
Biography:
Elguja Medzmariashvili is a Doctor of Military Science; Doctor of Technical Science; Professor; Major-General; academician of Georgian National Academy of Science. He is a General constructor, senior scientific officer and head of the Institute of Constructions, Special Systems and Engineering Maintenance of Georgian Technical University. He has published more than 250 scientific works, including monographs, manuals, articles, and inventions. He is General Constructor of the first Georgian space object launched into orbit on July 23, 1999. He is a companion of the highest military state award – Vakhtang Gorgassali 1st degree order.
Abstract:
The paper discusses transformational engineering structures. They are creating three main groups: structure of three elements; structures of flexible elements – the principle of tensioned architecture; technological structures – using the principles of grouting and reinforcement. The paper completely discusses transformable engineering structures, composite rigid and flexible elements. Here are discussed the stages of form shaping and the principles of form fixation. The generalized model of each structure is discussed on the base of such logic. They are giving possibility to move on real specific constructional structures from specific schemes.
Liang-Jun Yin
University of Electronic Science and Technology of China
China
Title: A novel way to prepare Eu2+ doped Y-Si-O-N based phosphor
Biography:
Liang-Jun Yin is working as a Professor in School of Energy Science and Engineering at University of Electronic Science and Technology of China.
Abstract:
A novel Y4Si2O7N2: Eu2+ phosphor has been successfully synthesized by an interesting pretreatment method of using HI. Without HI, The appearance of Eu doped Y4Si2O7N2 (YSiON: Eu) is yellow and become darken with the higher concentration of Eu. Unfortunately, no emission is found in the YSiON: Eu. Amazingly, with the use of HI, Y4Si2O7N2: Eu2+ (YSiON: Eu, HI) turns white and basically unchanged with the concentration of Eu. The produced YSiON: Eu, HI phosphor shows a broad emission band in the range of 400–550 nm with a peak at 440 nm. Thus, there must be large difference between YSiON: Eu and YSiON: Eu, HI. The use of HI effectively promote the reduction of Eu3+ to Eu2+ ions in Y4Si2O7N2 crystal lattice, confirmed by PL spectra, absorption spectra and X-ray absorption near-edge structure (XANES) analysis .
Balla Diop Ngom
Universit Cheikh Anta Diop
de Dakar
Senegal
Title: Synthesis, characterisation and proton irradiation of WC1 xBx for space applications
Biography:
Balla Diop Ngom is a 36 years old Senegalese nanomaterial’s scientist who completed a PhD in Physics at the University Cheikh Anta Diop of Dakar (UCAD) with a Magna Cum Laude merit award, and a second PhD in Physics with the University of the Western Cape, South Africa. He conducted postdoctoral studies at EMT-INRS-Canada; iThemba LABS-NRF-South Africa and UNISA-South Africa. He has produced substantial 30 ISI scientific publications and 3 ISI proceedings. He is currently the Director of the LPN/GPSSM Laboratory at UCAD. His research interests include the design, growth, and ageing control of the nanosystems processing, using Pulsed Laser Deposition.
Abstract:
Achieving effective radiation shielding at low cost and mass is of major interest to the space industry. This article presents a pioneering investigation into the shielding properties of WC1 xBx to low energy protons. This investigation is an attempt to extend the bullet proof applications of W2B5/B4C to space radiation shielding applications, offering low cost and low mass protection against radiation including X-rays, neutrons, gamma rays and protons in low Earth orbit. The focus in this article, however, is on low energy protons. The WC1 xBx coatings were synthesised by the pulsed laser ablation of B4C/W2B5. They were characterised by X-ray Diffraction, Atomic Force Microscopy, X-ray Photoelectron Spectroscopy and Heavy Ion Elastic Recoil Detection Analysis. The characterisation and data analysis strongly suggest a solid solution of the form WC1-xBx which contains crystalline and amorphous forms. The effects of 900 keV proton irradiation were the melting and subsequent growing of nanorods on the surface of the coating, the lateral transfer of the proton energy across the coating surface, and the lateral displacement of matter along the coating surface. These effects show that the coating is a promising cost effective and low mass radiation shield against low energy protons.
Biography:
Chidozie C. Nwobi-Okoye obtained his PhD in Industrial and Systems Engineering from University of Benin, Nigeria. He is currently the director of postgraduate programs in the Faculty of Engineering of Anambra State University, Uli, Nigeria. He has published more than 28 papers in reputed journals and over 7 papers in local and international conference proceedings, and currently serving as a reviewer as well as in the editorial board of some reputable journals.
Abstract:
A major problem in the development of materials for engineering use is the precise prediction and modeling of its properties. Experimental determination of properties of materials is very expensive, and often development of materials to posses certain properties requires series of costly trials and errors. Sometimes one needs to conduct thousands of experiment in order to precisely predict and model the properties of certain materials required for engineering use. Quite often, in order to avoid the use of experiments mathematical models are used, but mathematical models do fail in certain cases, thus necessitating the use of computational models and artificial intelligence, which is often bereft of complex and messy mathematics, as an alternative. This paper highlights the importance and promise of the use of computational models and artificial intelligence for material development and modeling of their properties. Also discussed is the immense potential of the miracle material, graphene, clay-polymer composites, superconductors etc, advances in modeling their properties and their possible applications in aeronautics, aerospace and mechanical engineering. It is shown that the current and future advances in the development of materials for aeronautics, aerospace and mechanical engineering applications depend to a large extent on the development of excellent computational models and artificial intelligence techniques for modeling engineering materials.
V. Rajendran
K.S. Rangasamy College of Technology
India
Title: : Nano-sized porous mno2 nano particles for electrochemical super capacitor utilizing neutral electrolytes
Biography:
V. Rajendran is the Director, Research & Development, KSR Group of Institutions and Centre for Nano Science and Technology (CNST), K.S Rangasamy College of Technology, Tamil Nadu, India. He has had the privilege of obtaining his Ph.D. degree in Ultrasonics from Annamalai University. He is a fellow and a life member in many Scientific Societies both in India and abroad. He has published more than 189 papers in peer reviewed journals and serving as an associate editor/editorial board member in many leading international journals in nanoscience and technology.
Abstract:
Electrochemical Capacitors (ECs) are attracting energy storage device have gained enormous attention in recent years due to their higher power density and longer cycle-life compared to batteries. It finds potential application like hybrid electric vehicles and pulse power sources for many electronic devices. Different materials are explored as possible electrodes for ECs in aqueous electrolytes including carbonaceous materials, conducting polymers, and transition-metal oxides. Among many transition-metal oxides, MnO2 is the most promising electrode material due to its cheaper, abundance, and environmentally friendly nature. Even though, the theoretical specific capacitance of MnO2 is ~1380 F/g, only less than 30% of its value being realized. Thus, there is a demand for newer material to fulfill the electrochemical properties of charge storage mechanism as electrode. In this study, we synthesis porous MnO2 nanoparticles with large surface area through soft template method using cationic surfactant. The electrochemical measurements are carried out in a three electrode experimental set-up with MnO2 slurry coated SS plate as a working electrode. The Pt foil is used as a counter electrode, while Ag/AgCl is used as a reference electrode. The electrochemical studies namely cyclic voltammetry, chronopotentiometry and impedance spectroscopy are performed in alkali metal sulphate electrolytes (Li2SO4, Na2SO4 and K2SO4). The observed results reveal that porous MnO2 nanoparticles exhibit ideal capacitive behaviour in all electrolytes. Furthermore, an increased capacitance is explored in Na2SO4 electrolyte compared to other electrolytes. Thus, it is evident from the above study that capacitance achieved in Na2SO4 electrolyte is more suitable for ECs applications.
SM Hussaini
BITS-Pilani, Hyderabad
India
Title: Investigation of ass 316 formability at elevated temperature
Biography:
SM Hussaini has submitted his Ph.D these at BITS-Pilani, Hyderabad campus and waiting for final defense. He is working as a lecturer in the same institute. Prior to this he was worked in Indian Space Research Organization (ISRO) at Shriharikota. There he was worked on development of mechanical systems for integration of GSLV-MK3. He has published more than 10 papers in reputed journals and conference proceedings.
Abstract:
Sheet metal forming of high strength materials at elevated temperature is one of the important processes in industries. The present work is aimed to study the formability of austenitic stainless steel (ASS) 316 at elevated temperatures. Dynamic strain aging (DSA) region was observed for ASS 316 in the temperature range of 400 to 600°C, so the investigation is limited to bellow this temperature. Limiting drawing ratio and thickness of the drawn cup are the indicators of formability in deep drawing. In the present investigation circular blanks are deep drawn at room temperature, 150 ◦C and 300 ◦C using a 20 ton hydraulic press coupled with a furnace. Finite element simulations have carried out using Dyna form with LS-Dyna solver. Simulations and experimental results show an increase in the limiting drawing ration as the temperature increases and a decrease in the thickness of the drawn cup without any fracture. An artificial neural network model has developed for the prediction of the cup thickness at different locations. The comparison between these sets of results indicates the reliability of the predictions. It was found that there is a good agreement between the experimental and predicted values.
Abhulimen I. U
Ambrose Alli University
Nigeria
Title: Mechanical characteristics of Al-CaCo3/Zn composites
Biography:
Abhulimen I. U is working as a Professor in the 1Department of Materials and Production Engineering at Ambrose Alli University, Ekpoma, Edo State, Nigeria
Abstract:
Effect of CaCO3 particle (100µm) addition on the mechanical properties of aluminium-0.5% Si alloy has been investigated. Samples are produced using conventional stir casting method and homogenized at 5500C for four hours. Mechanical properties studied are tensile strength, tensile elongation, hardness and fracture strength. Cast samples containing 25wt%CaCO3 and 5wt%Zn exhibit the highest tensile strength (134.3MPa) owing to a breakdown of grain structure caused by the dissolution of CaAl2 and AlFeSi into the α-aluminium matrix. Samples containing 5wt%CaCO3and 5wt%Zn have superior hardness (131.1MPa) due to high volume fraction of precipitates in the microstructure. The microstructure shows the presence of AlFeSi, Mg2Si and CaAl2intermetallics in the α- aluminium matrix.