Local Pool Boiling Coefficients on the Outside Surface of a Horizontal Tube

[+] Author and Article Information
Myeong-Gie Kang

Department of Mechanical Engineering Education,  Andong National University 388 Songchun-dong, Andong-city, Kyungbuk 760-749, Korea

J. Heat Transfer 127(8), 949-953 (Dec 15, 2004) (5 pages) doi:10.1115/1.1929785 History: Received March 31, 2004; Revised December 15, 2004

Changes in local pool boiling heat transfer coefficients on the outside surface of a 51mmdia horizontal tube have been investigated experimentally in water at atmospheric pressure. The local values were determined at every 45deg from the very bottom to the uppermost of the tube periphery, and a representative value was suggested. The maximum and the minimum local coefficients were observed at the azimuthal angles of 45 and 180deg, respectively, from the tube bottom. The coefficient at 90deg can be suggested as the representative of the coefficients. The major mechanisms affecting heat transfer on the surface were liquid agitation and bubble coalescence. Moreover, it is identified that the data can be curve fitted as hb=C1+C2q.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Schematic of the experimental apparatus

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Figure 2

Plots of q″ and hb versus ΔTsat

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Figure 3

Photos of pool boiling on the horizontal tube surface

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Figure 4

Comparison of the calculated average heat transfer coefficients with the measured coefficients at θ=90deg

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Figure 5

Comparison of the calculated heat transfer coefficients with the measured coefficients



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