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International Heat Transfer Conference 5

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EFFECT OF GEOMETRY AND WALL THICKNESS ON HEAT TRANSFER FROM LONGITUDINAL FINS TO BOILING LIQUIDS

Chien-Cheng Shih
University of Illinois, Urbana, Illinois 61801, U.S.A.

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

DOI: 10.1615/IHTC5.110
pages 15-19

Abstract

All prior design methods for extended surfaces used in boiling heat transfer have employed one-dimensional conduction calculations. The present study used two-dimensional calculations on a large digital computer. Longitudinal, rectangular fins of five metals in water and Freon-113 boiling at atmospheric pressure were considered. The heat duty and the temperature distribution in the fin and the wall were found. Variables included fin lengths from 0.2 to 3-5 cm, aspect ratios from 1/6 to 6, clearances from 0.8 to 15 cm, wall thickness from 0.15 to 3.0 cm, and conductivities from stainless steel to copper. For small Biot numbers, the 1-D and 2-D cases are identical. Optimizations are based on volume or projected area.

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