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RESEARCH PAPERS: Boiling and Condensation

Gas-Saturated Pool Boiling Heat Transfer From Smooth and Microporous Surfaces in FC-72

[+] Author and Article Information
J. P. O’Connor

Systems Group, Texas Instruments, Plano, TX 75086

S. M. You, J. Y. Chang

Department of Mechanical and Aerospace Engineering, University of Texas at Arlington, Arlington, TX 76019-0023

J. Heat Transfer 118(3), 662-667 (Aug 01, 1996) (6 pages) doi:10.1115/1.2822683 History: Received July 14, 1995; Revised May 14, 1996; Online December 05, 2007

Abstract

The effects of surface treatments and “gassy-subcooling” on pool boiling heat transfer are quantified by testing both smooth and treated surfaces at gassy-subcooling levels from O°C to 40°C (1 atm) and 40°C to 85°C (3 atm). Incipient and nucleate boiling wall superheats decrease over this range of gassy-subcooling. At gassy-subcooling levels greater than 20°C, the boiling curves for the smooth surface indicate two distinct regions governed by different heat transfer mechanisms, one in which the boiling process is influenced by the presence of dissolved gas, the other by boiling of the pure liquid. The critical heat flux (CHF) for each surface continually increases with increased levels of gassy-subcooling and the CHF sensitivity to gassy-subcooling is higher for the treated surface. The CHF increase due to combined surface treatment and gassy-subcooling (85°C) is ~400 percent (78 W/cm2 ).

Copyright © 1996 by The American Society of Mechanical Engineers
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