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RESEARCH PAPERS: Boiling and Condensation

A Painting Technique to Enhance Pool Boiling Heat Transfer in Saturated FC-72

[+] Author and Article Information
J. P. O’Connor, S. M. You

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

J. Heat Transfer 117(2), 387-393 (May 01, 1995) (7 pages) doi:10.1115/1.2822534 History: Received January 01, 1994; Revised November 01, 1994; Online December 05, 2007

Abstract

A benign method of generating a surface microstructure that provides pool boiling heat transfer enhancement is introduced. Pool boiling heat transfer results from an enhanced, horizontally oriented, rectangular surface immersed in saturated FC-72, indicate up to an 85 percent decrease in incipient superheat, a 70 to 80 percent reduction in nucleate boiling superheats, and a ∼ 109 percent increase in the critical heat flux (CHF = 30 W/cm2 ), beyond that of the nonpainted reference surface. For higher heat flux conditions (19 to 30 W/cm2 ), localized dryout results in increased wall superheats (8 to 48°C). The enhanced surface heat transfer coefficients are four times higher than those from the reference surface and similar to those from the Union Carbide High Flux surface. Photographs that identify differences in bubble size and departure characteristics between the painted and reference surfaces are presented.

Copyright © 1995 by The American Society of Mechanical Engineers
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