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Plenaries

Title: The Legacy of Donald Q. Kern Redux: Imperative of Energy Conservation and Enhancement of Process Heat and Mass Transfer

Raj M. Manglik

Raj M. Manglik, PhD, ASME Fellow
Professor of Mechanical and Materials Engineering
Thermal-Fluids & Thermal Processing Laboratory, University of Cincinnati, Cincinnati, OH

Abstract: The imperatives of sustainability warrant the mitigation of both energy consumption and environmental degradation. The efforts to achieve these goals are perhaps most acutely underscored by the need for not only conserving primary energy resources, but also their conversion, utilization, and recovery in every industrial, commercial, and domestic application. This energy crisis has become a subject of considerable present-day debate with enormous economic and political implications. However, the primary problems in conversion and conservation, which inherently involve a heat and/or mass transport process, have several viable engineering solutions, particularly with the use of enhancement techniques. Heat and mass transfer in the process industry and the pioneering work of Donald Q. Kern has become acutely important, and its reiteration provides unique antecedent insights. This presentation delineates the development and applications of enhancement devices and methods, which have driven significant technological changes in the past and continue to do so in contemporary times. Some specific examples of innovative and transformational engineering science in, single-phase flow convection, phase-change processes with boiling, and spray-droplet engendered mass transfer are highlighted. Their implementation directly contributes to increased heat/mass exchanger performance, thereby effecting energy, material, and cost savings, as well as a consequential mitigation of environmental degradation – or a pathway toward sustainability of both our energy-driven economy and our environment. Moreover, general current trends in the field as well as reflections on significant contributions from the past and their impact on future thermal processing excursions are delineated.

Biography: Dr. Raj M. Manglik, Professor of Mechanical Engineering and Director, Thermal-Fluids & Thermal Processing Laboratory at the University of Cincinnati, is a Fellow of ASME and ASHRAE, Senior Member of AIChE, and member of Sigma Xi and Tau Beta Pi. He received his Ph.D. from Rensselaer Polytechnic Institute, M.S. from Iowa State University, and B.Tech. from the Indian Institute of Technology – Madras, all in Mechanical Engineering. He has served as a two-term Associate Editor as well as Guest Editor of ASME Journal of Heat Transfer, and Editor-in-Chief of the Journal of Enhanced Heat Transfer. He has published more than 260 archival papers and technical reports, and has given numerous keynote and plenary lectures at a variety of national and international forums. He has also published 15 highly acclaimed books, monographs, and book chapters, including the classical textbook Principles of Heat Transfer (7th and 8th Eds., Cengage) and the monograph Plate Heat Exchangers: Design, Applications and Performance. His research expertise spans a broad spectrum of thermal science and engineering, and he is a leading international expert on interfacial phenomena, boiling heat transfer, bubble dynamics and droplet-spray transport processes, thermal processing of polymeric materials and non-Newtonian flows, enhancement of heat transfer, compact and high-performance heat exchangers, and waste-heat recovery and energy systems. He has been the recipient of the very first CAREER Award (1995) from the National Science Foundation, ASME Melville Medal (2006) for the best original scientific contribution, the ASME HTD 75th Anniversary Medal (2013), Heat Transfer Memorial Award (2016), and the Potter Gold Medal (2018), among many other research and teaching awards.

 

Title: On the Quench of Spray Cooling: When Does it Occur?

Yasuyuki Takata

Yasuyuki Takata, DEng
Professor, Department of Mechanical Engineering
International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University

Abstract: It is of great importance for water spray cooling of hot steel to predict “quench point” where rapid cooling occurs by the direct contact between liquid and hot surface. Despite a number of previous studies, the mechanism of onset of quench has not yet been clearly understood. One of the reasons is due to the oxide layers formed on the hot surface. These oxide layers has non-uniform porous structure and low thermal conductivity and hence increase the quenching temperature. In the present study, we try to explain the quenching temperature based on the assumption of the transient heat conduction for a contact between two semi-finite bodies. We used several different artificial oxide layers and made a series of experiments on spray cooling and observation of single individual droplet impinging onto the hot oxide surfaces. As a result, the onset of quench always seems to happen at the contact surface temperature of around 250°C regardless of the composition and thickness of the oxide layer.

Biography: Yasuyuki (Yas) Takata is Professor of Thermofluid Physics in the Department of Mechanical Engineering and a Principal Investigator of the International Institute for Carbon-Neutral Energy Research (WPI-I2CNER), Kyushu University, Japan. His research area covers liquid-vapor phase change heat transfer, especially the effect of surface wettability and nano-micro structure on pool boiling and spray cooling, heat transfer devices, and thermophysical properties of hydrogen, as well as a database of thermophysical properties of fluids. He received a number of awards such as The JSTP Best Paper Award in 2010, Heat Transfer Society Award for Scientific Contribution in 2002, and JSME Thermal Engineering Achievement Award in 2010, JSME Thermal Engineering Award for International Activity in 2018, ASME ICNMM2018 Outstanding Leadership Award in 2018 and ATPC Significant Contribution Award in 2019. He served as a head of Thermal Engineering Division and executive board director of the Japan Society of Mechanical Engineers (JSME), the President of the Heat Transfer Society of Japan (HTSJ) and the President of the Japan Society of Thermophysical Properties (JSTP). He is currently the President of Asian Union of Thermal Science and Engineering (AUTSE) since November 2020. He is a Council Member of the Science Council of Japan since October 2020.