工程科学前沿讲坛：Professor S. C. Yao（Carnegie Mellon University）学术报告

Cooling of Electronics

主讲人 : Professor S. C. Yao

More than half of the failures of electronics come from thermal over-heating, because the failure rate increases exponentially with temperature. Therefore, thermal management is a major focus in electronics industry especially in aero, space, automotive and military electronics due to their severe thermal environment, and in network, and process-control industries due to the needs of high reliability.

In the low-power electronic systems, heat conduction and air cooling are commonly utilized, and thermal software is integrated in the electronic design software.  At higher power dissipation rate, liquid cooling is used to deliver the heat to a remote location for disposal.   Micro-channel heat sink is frequently used, and advanced design methods are established.  When the liquid cooling is insufficient, phase change processes such as the boiling or spay cooling are utilized that the heat transfer capability is significantly improved and the needed fluid flow is much reduced.  The newest Cray supercomputer is the first commercial electronics utilizing spray cooling, which was first proposed by the author in 1988.  Recently the micro-scale cooling devices are explored to provide localize cooling in electronics.  In this presentation, the various types of the thermal management studies at CMU will be reviewed and discussed.

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主讲人简介：

Professor Yao received his Ph.D. from U.C. Berkeley in 1974. He worked at Argonne National Lab for 3 years and joined Carnegie Mellon University in 1977.  He also served as the Pao YuKang Chaired professor at the ZheJiang University in China since 2010. Prof. Yao has conducted research of multi-phase systems over 40 years.  He performed research on film boiling, boiling in narrow gaps and tube bundles, sprays in  llurgical processes and for cooling of electronics etc. Recently he has focused on MEMS micro thermal fluids for electronics cooling and micro fuel cell applications. 

Dr. Yao is a FELLOW of the ASME and served as the chairman of Fire and Combustion Committee and the Long Range Planning Committee previously.  He has organized various national and international conferences. He has also served twice as the interim Head at the Mechanical Engineering Dept. of CMU.