Liquid-Solid Contact During Flow Film Boiling of Subcooled Freon-11

[+] Author and Article Information
K. H. Chang, L. C. Witte

Department of Mechanical Engineering, University of Houston, Houston, TX 77204

J. Heat Transfer 112(2), 465-471 (May 01, 1990) (7 pages) doi:10.1115/1.2910401 History: Received August 29, 1988; Revised June 09, 1989; Online May 23, 2008


Liquid-solid contacts were measured for flow film boiling of subcooled Freon-11 over an electrically heated cylinder equipped with a surface microthermocouple probe. No systematic variation of the extent of liquid-solid contact with wall superheat, liquid subcooling, or velocity was detected. Only random small-scale contacts that contribute negligibly to overall heat transfer were detected when the surface was above the homogeneous nucleation temperature of the Freon-11. When large-scale contacts were detected, they led to an unexpected intermediate transition from local film boiling to local transition boiling. An explanation is proposed for these unexpected transitions. A comparison of analytical results that used experimentally determined liquid-solid contact parameters to experimental heat fluxes did not show good agreement. It was concluded that the available model for heat transfer accounting for liquid-solid contact is not adequate for flow film boiling.

Copyright © 1990 by The American Society of Mechanical Engineers
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