Dr. Akbar invited Dr. Mostafa Ghiaasiaan and Dr. Zhuomin Zhang from Georgia Institute of Technology to visit College of Engineering on October 17 and 18, 2024. Dr. Ghiaasiaan presented Cryogenics and Cryocoolers research at Georgia Tech Cryo lab. Cryogenics has a broad and rapidly growing range of applications. Key sectors currently benefiting from cryogenics include medical care, transportation, high-energy physics, electrical power and energy, avionics, and quantum computing. Central to many of these applications are cryocoolers – robust mechanical devices capable of generating cryogenic temperatures without the need for liquid cryogens. Current areas of intense research for aerospace applications include miniaturization for SmallSats, and large-capacity units for In-Situ Research Utilization. This seminar will provide an overview of 15 years of research conducted at the Georgia Tech Cryolab, focusing on Stirling and pulse tube cryocoolers. TSU students and faculty attended the two seminars.

Dr. Zhang presented Nanoscale Thermal Radiation. Traditional analysis of radiative heat transfer between solids uses surface emissivity and reflectivity to calculate the net energy exchange. The interaction of electromagnetic waves with micro/nanostructured materials modifies their far-field radiative properties. Nanoscale thermal radiation has promising applications in advanced space energy harvesting, solar energy, nanomanufacturing, and thermal imaging and thermal management. This presentation gives an overview of the research activities in the Nanoscale Thermal Radiation lab at Georgia Tech in the past 20+ years. Additionally, I will share some experience in teaching nanoscale heat transfer.

Dr. Ghiaasiaan is currently a Professor in the George W.  Woodruff School of Mechanical Engineering at the Georgia Institute of Technology. He has authored more than 240 publications on transport phenomena and multiphase flow. He is a Fellow of ASME and served as Executive Editor for the Annals of Nuclear Energy and Associate Editor for the ASME Journal of Heat Transfer. He is the author of two textbooks: Two-Phase Flow, Boiling and Condensation in Conventional and Miniature Systems (2nd Edition, Cambridge University Press, 2017) and Convective Heat and Mass Transfer (2nd Edition,  CRC Press, 2018).

Dr. Zhang is the J. Erskine Love, Jr. Professor in Mechanical Engineering at Georgia Institute of Technology. His research interests are in micro/nanoscale heat transfer especially nanoscale thermal radiation for energy harvesting. He has written a book on Nano/Microscale Heat Transfer (1st ed. 2007, 2nd ed. 2020). Dr. Zhang has co-authored more than 220 journal papers and given over 400 keynote, invited and contributed presentations and seminars. Dr. Zhang currently serves as an Editor-in-Chief of Annual Review of Heat Transfer; he is an associate editor of the Journal of Thermophysics & Heat Transfer and the Journal of Quantitative Spectroscopy & Radiative Transfer. Dr. Zhang is a Fellow of ASME, AAAS, and APS. He was a recipient of the 1999 Presidential Early Career Award for Scientists and Engineers (PECASE) award, 2015 ASME Heat Transfer Memorial Award, 2021 ASME Yeram S. Touloukian Award, and the 2021 AIAA Thermophysics Award.

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