Plenary Lecture

Heat Transfer Measurement and Analysis in Cooling Systems for Hot Components

Professor Hyung Hee Cho
Yonsei University
Seoul, Korea
E-mail: hhcho@yonsei.ac.kr

Abstract: Proper thermal design is an essential part of hot component developments. Various cooling methods, such as internal passage cooling, impingement jet cooling and film cooling, are widely used to protect hot components from high thermal loads and to achieve higher thermal efficiency. Unsuitable thermal design causes local thermal crack and structural failure and resulting in a reduction of system life. To achieve proper thermal design for hot components, it is very important to conduct detailed measurement and analysis of internal and external heat transfer distribution.
Several methods, such as naphthalene sublimation techniques, thermochromic liquid crystal techniques and infrared thermography, etc, are developed and widely used to measure the heat transfer distribution. The measurement methods are successfully applied to obtain detailed and precise information about external and internal heat transfer distributions of ribbed or dimpled passages, film cooled surface and array jet cooled wall. The detailed measurements make it possible to achieve better thermal design for hot components in gas turbine and rocket/ramjet engines. This lecture will introduce various experiences about heat transfer measurements and cooling system design conducted in Heat Transfer Laboratory at Yonsei University.

 

Brief Biography of the Speaker:
Hyung Hee Cho received the B.S. and M.S. degrees in mechanical engineering from Seoul National University, Seoul, Korea, in 1982 and 1985, respectively. He received Ph.D. degree in mechanical engineering from University of Minnesota, Minneapolis, USA. His dissertation mainly deals with heat/mass transfer characteristics in cooling technology which is mostly applied to gas turbine blades/combustors as well as ramjet combustors.
In 1995, he joined the Department of Mechanical Engineering, Yonsei University, Seoul, Korea, where he is currently a full professor in the School of Mechanical Engineering. From 2003 to 2005, he was the Chairman of Department of Mechanical Engineering at Yonsei University. From 2005 to 2007, he held position as the Associate Dean of College of Engineering at Yonsei University.
His research interests include heat transfer control and design in macro-scale devices as well as micro/nano-scale components. For macro-scale devices, he has been working on heat transfer in turbomachineries and rocket/ramjet. Especially, with intensive research on various cooling techniques such as film cooling, internal passage cooling, and impingement/effusion cooling, he has accomplished major research achievements including numerous papers and patents. For micro/nano-scale components, he has worked on thermal transport phenomena in low dimensional materials as well as thermal management in semiconductor devices. Recently, he has been working on performance improvement of proton exchange membrane fuel cell (PEMFC) by controlling heat transfer and flow characteristics on separator plate.
He is a recipient of numerous awards such as KSME Scientific Achievement Award (2000), Yonsei Academic Achievement Award (2001), KSFTS best paper award (2006) and KFMA Scientific Achievement Award (2008). He has served as a committee member for various institutions such as ASME K-14 (Heat Transfer in Gas Turbine) Committee, ASME-PID Committee, and ISO TC-192 (Gas Turbine). He also has served as a Vice President of Energy and Power Division of KSME (Korean Society of Mechanical Engineers) and a Chairman for the Gas Turbine division of KFMA (Korean Fluid Machinery Association). He has served as an associate editor of Journal of Mechanical Science and Technology and International Journal of Air-Conditioning and Refrigeration. He is currently an editorial board for JP Journal of Heat and Mass Transfer, Advances in Mechanical Engineering and International Journal of Fluid Machinery and Systems.