Prediction of the Condensation Coefficient on Horizontal Integral-Fin Tubes

[+] Author and Article Information
R. L. Webb, M. A. Kedzierski

Department of Mechanical Engineering, Pennsylvania State University, University Park, Pa. 16802

T. M. Rudy

Exxon Research and Engineering Company, Florham Park, N.J. 07932

J. Heat Transfer 107(2), 369-376 (May 01, 1985) (8 pages) doi:10.1115/1.3247424 History: Received November 22, 1983; Online October 20, 2009


A theoretical model is developed for prediction of the condensation coefficient on horizontal integral-fin tubes for both high and low surface tension fluids. The model includes the effects of surface tension on film drainage and on condensate retention between the fins. First, the fraction of the tube circumference that is flooded with condensate is calculated. Typically, the condensation coefficient in the flooded region is negligible compared to that of the unflooded region. Then the condensation coefficient on the unflooded portion is calculated, assuming that surface tension force drains the condensate from the fins. The model is used to predict the R-11 condensation coefficient on horizontal, integral-fin tubes having 748, 1024, and 1378 fpm. The predicted values are within ±20 percent of the experimental values .

Copyright © 1985 by ASME
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