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

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
Article
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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″.
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Copyright © 2005 by American Society of Mechanical Engineers
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References

1
Chun, M. H., and Kang, M. G., 1998, “Effects of Heat Exchanger Tube Parameters on Nucleate Pool Boiling Heat Transfer,” ASME J. Heat Transfer, 120 , pp. 468–476.
2
Lance, R. P., and Myers, J. E., 1958, “Local Boiling Coefficients on a Horizontal Tube,” AIChE J.  [CrossRef], 4 (1), pp. 75–80.
3
Cornwell, K., and Einarsson, J. G., 1990, “Influence of Fluid FLow on Nucleate Boiling from a Tube,” Exp. Heat Transfer, 3 , pp. 101–116.
4
Gupta, A., Saini, J. S., and Varma, H. K., 1995, “Boiling Heat Transfer in Small Horizontal Tube Bundles at Low Cross-flow Velocities,” Int. J. Heat Mass Transfer  [CrossRef], 38 (4), pp. 599–605.
5
El-Genk, M. S., and Gao, C., 1999, “Experiments on Pool Boiling of Water from Downward-facing Hemispheres,” Nucl. Technol., 125 , pp. 52–69.
6
Cheung, F. B., Haddad, K. H., and Liu, Y. C., 1999, “Boundary-Layer-Boiling and Critical-Heat-Flux Phenomena on a Downward-Facing Hemispherical Surface,” Nucl. Technol., 126 , pp. 243–264.
7
Kang, M. G., 2000, “Effect of Tube Inclination on Pool Boiling Heat Transfer,” ASME J. Heat Transfer  [CrossRef], 122 , pp. 188–192.
8
Cornwell, K., and Houston, S. D., 1994, “Nucleate Pool Boiling on Horizontal Tubes: A Convection-based Correlation,” Int. J. Heat Mass Transfer  [CrossRef], 37  (Suppl. 1), pp. 303–309.
9
Kang, M. G., 2001, “Hysteresis Effects in Pool Boiling of Water,” JKSME B, 25 (8), pp. 1037–1045.

Figures

Grahic Jump Location
+Comparison of the calculated heat transfer coefficients with the measured coefficients
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Comparison of the calculated heat transfer coefficients with the measured coefficients
Figure 5

Comparison of the calculated heat transfer coefficients with the measured coefficients

Grahic Jump Location
+Comparison of the calculated average heat transfer coefficients with the measured coefficients at θ=90deg
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Comparison of the calculated average heat transfer coefficients with the measured coefficients at θ=90deg
Figure 4

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

Grahic Jump Location
+Photos of pool boiling on the horizontal tube surface
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Photos of pool boiling on the horizontal tube surface
Figure 3

Photos of pool boiling on the horizontal tube surface

Grahic Jump Location
+Plots of q″ and hb versus ΔTsat
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Plots of q″ and hb versus ΔTsat
Figure 2

Plots of q″ and hb versus ΔTsat

Grahic Jump Location
+Schematic of the experimental apparatus
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Schematic of the experimental apparatus
Figure 1

Schematic of the experimental apparatus

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