Mon December 8th 2014
16:00 – 17:00
ZH286
Seminar Heat Transfer Mechanisms in Pool and Flow Boiling
Jungho Kim

Details:

The high heat flux capability of phase change heat transfer results from heat removal by latent heat and increased single phase heat transfer by local agitation of the fluid as bubbles depart the surface. The exact mechanisms by which heat is transferred, however, are unclear despite much research over the past decades, and many of the assumed mechanisms upon which models have been proposed have been found to be incorrect. The talk will discuss the results of recent work in pool (nucleate boiling and CHF) and flow boiling where local heat flux measurements were made. It is found that the primary mechanism by which heat is transferred is through agitation of the single-phase fluid by growing, merging, and passing bubbles.


Biography
Jungho Kim is a Professor in the Department of Mechanical Engineering at the University of Maryland where he performs research and teaches courses in a broad range of thermal sciences areas. He developed the microheater array technique under NASA support to measure time and space resolved heat transfer rates during boiling and spray cooling. He was the principal investigator for a microgravity pool boiling experiment (MABE) that flew on the International Space Station in 2011. He has received funding in the past from NASA, NSA, NIST, Parker Hannefin, ONR, NSF, Northrup Grumman, WPAFB, ATEC, and Weatherbug. He as the former Chair of the ASME K-13 committee on Multiphase Heat Transfer, and well as an Associate Editor for the International Journal of Multiphase Flow. He has won numerous awards for teaching and instrumentation design, and is the holder of two patents.
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