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

Myeong-Gie Kang

doi:10.1115/1.1929785

Journal of Heat Transfer | Volume 127 | Issue 8 | Technical Brief

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TECHNICAL BRIEFS

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

Myeong-Gie Kang

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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

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Abstract

Changes in local pool boiling heat transfer coefficients on the outside surface of a $51 mm dia$ horizontal tube have been investigated experimentally in water at atmospheric pressure. The local values were determined at every $45 \deg$ 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 $180 \deg$ , respectively, from the tube bottom. The coefficient at $90 \deg$ 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 $h_{b} = C_{1} + C_{2} q^{″}$ .

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Figure 1

Schematic of the experimental apparatus

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Figure 2

Plots of q″ and hb versus ΔTsat

Photos of pool boiling on the horizontal tube surface

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Figure 3

Photos of pool boiling on the horizontal tube surface

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

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Figure 4

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

Comparison of the calculated heat transfer coefficients with the measured coefficients

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Figure 5

Comparison of the calculated heat transfer coefficients with the measured coefficients

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Kang M. Local Pool Boiling Coefficients on the Outside Surface of a Horizontal Tube. ASME. J. Heat Transfer. 2004;127(8):949-953. doi:10.1115/1.1929785.

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

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