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BOILING HEAT TRANSFER FROM SINGLE FINS

K. W. Haley
University of Illinois, Urbana, Illinois

J. W. Westwater
Department of Chemical Engineering, University of Illinois Urbana, Illinois 61801 USA

Abstract

Nucleate, transition, and film boiling may occur simultaneously at adjacent positions on a fin in a boiling liquid. The heat transfer coefficient is not uniform. The usual formulas for fins then are seriously wrong. A numerical technique was used to solve for fins in boiling liquids. Tests with Freon-113 and isopropyl alcohol agree with the predictions within 20%. The heat rejected by a fin in a boiling liquid may be an order of magnitude greater than for the base metal without fins.

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