Way Better Combustion Through Heat Recirculation
Thursday, November 21, 2019 @ 4:00 p.m.
3110 Etcheverry Hall
Dr. Janet Ellzey – Professor of Mechanical Engineering & Engineering Foundation Centennial Teaching Fellow, University of Texas at Austin
Russell Severance Springer Colloquium
Abstract: Worldwide emphasis on fuel efficiency, low emissions, and use of low-quality fuels such as biogas continues to drive the development of combustors that operate over a wider range of fuel/air ratios and burning velocities than their conventional counterparts. Acceleration of reaction rates is required to increase burning velocities and widen fuel/air operating ranges over values achievable in conventional combustors, and extensive research over the last few decades has shown that transferring heat in a reactor from hot combustion products to incoming reactants can accomplish this acceleration without external energy addition. These reactors, called heat recirculating reactors, use various geometries and flow strategies to optimize the heat transfer. The enhanced combustion allows these reactors to operate over a wide range of conditions with applications to low-emissions reactors, fuel reformers, and thermal oxidizers.
This presentation will begin with an explanation of the simplest premixed flame as described by Mallard and Le Chatelier over 100 years ago which did not consider the effect of walls, and then show how the characteristics of the combustion process is enhanced by heat transfer through solid surfaces for flames in tubes, porous media, and counterflowing channels.
Recent work using additive manufacturing to create novel flow geometries with the goal of further optimizing the combustion process will be discussed.
Biography: Dr. Ellzey has an excellent record of accomplishment in teaching, research and professional service. She specializes in combustion and has been a faculty member of the Thermal/Fluid Systems area of the Walker Department of Mechanical Engineering since 1990. She currently conducts research on environmental technologies such as low-emissions combustors and fuel reformers. Dr. Ellzey was the winner of the 2005 Women in Engineering Student Advocate Award and she, along with her co-authors, received the Best Paper Award from the 2nd International ASME Conference on Energy Sustainability in 2008. In 2004, she created International Engineering Education (IEE), which develops study abroad programs for engineering students. She led IEE in her capacity as the Associate Director of the Chair of Free Enterprise and then as Assistant Dean until 2009. From 2009 to 2017, she was Vice Provost for International Programs and head of the International Office. In 2011, she was inducted into the Academy of Distinguished Alumni of the Department of Mechanical Engineering at the University of Texas at Austin. In 2017, she was elected to the Inaugural Class of Fellows of the Combustion Institute.
Hosted by: Professor Robert Dibble, 6159 Etcheverry Hall, (510)406-0031, email@example.com & Professor Jyh-Yuan Chen, 6163 Etcheverry Hall, (510)642-3286, firstname.lastname@example.org
Multi-Scale Structure Control for Advanced Functional Materials
Thursday, December 5, 2019 @ 4:00 p.m.
Tien Room, 6101 Etcheverry Hall
Ozgur Keles, Ph.D. – Assistant Professor, Chemical and Materials Engineering Department, San Jose State University
Abstract: Economic growth demands better products; hence, better materials. Specifically, product space in energy, defense, aerospace, and automotive industries requires materials that are multi-functional, lightweight, reliable, and tough. In addition, environmental regulations require sustainability. Comprehensive optimization of these requirements is possible through multi-scale structure control in multi-material systems. In this talk, I will discuss how we can control structure from nano-to-macro-scale using additive manufacturing and solution synthesis routes. Examples from hierarchical composites and ceramics will be provided with a design perspective. The use of kHz-range vibrations in local three-dimensional structure control will be introduced. Our recent work showed that vibration-assisted fused filament fabrication (VA-FFF) technique enhanced strength, toughness, and reliability of short-fiber-reinforced composites. We also reported improved mechanical, electrical, and optical properties in polymers via quantum dots and nano-scale structure control. The mechanistic origins of the toughness and reliability increases in additively manufactured biomimetic porous materials will be detailed. I will describe machine learning and high-throughput approaches towards the discovery of new electro-active material systems for the next-generation product innovation. In addition, the discussion will include evidence-based engineering education approaches and problems. For example, sustainable innovation of better products is strongly correlated to creativity at individual level, but how can we cultivate creative engineers? I will exemplify the use of virtual reality and artificial intelligence education approaches to enhance creativity and diversity.
Biography: Dr. Keles is an Assistant Professor of Chemical and Materials Engineering at San Jose State University. He received his B.S. and M.S. degrees from the Department of Metallurgical and Materials Engineering at Middle East Technical University, and his Ph.D. in Materials Engineering from Purdue University in 2013. Following, he joined Illinois Institute of Technology as a research associate, where he investigated the reliability of porous glasses and porous pharmaceutical compacts. His work on the deviations from Weibull statistics in porous ceramics was highlighted at the Gordon Research Conferences and awarded by the American Ceramic Society. His current research interests are multi-scale structure control, materials informatics, and engineering education. In 2019, Dr. Keles was selected as the advisor of the year at SJSU for his contributions to materials student clubs. He is also a photographer and digital artist who uses aesthetically appealing images and computer visualizations to improve student engagement, to aid student learning, and to foster creativity in engineering students. His work at the intersection of engineering, education, and arts was also highlighted in the The Member Journal of TMS.
Hosted by: Professor Tarek I. Zohdi, 6117 Etcheverry Hall, (510) 642-9172, email@example.com