Horizontal Plain and Low-Finned Condenser Tubes—Effect of Fin Spacing and Drainage Strips on Heat Transfer and Condensate Retention

[+] Author and Article Information
K. K. Yau

University of Cambridge, United Kingdom

J. R. Cooper, J. W. Rose

Department of Mechanical Engineering, Queen Mary College, University of London, United Kingdom

J. Heat Transfer 108(4), 946-950 (Nov 01, 1986) (5 pages) doi:10.1115/1.3247039 History: Received August 23, 1985; Online October 20, 2009


The paper reports a continuation of an experimental investigation of the effect of fin pitch on the heat transfer performance of horizontal, integral-fin tubes for condensation of steam at near-atmospheric pressure. The effects of “drainage strips” located along the lower edge of finned and plain tubes have been studied. These gave significant increases in the heat transfer coefficient for finned tubes but had only marginal effect for the plain tube. Condensate retention angles have also been measured for simulated condensation using water, ethylene glycol, and refrigerant-113 for finned tubes with and without drainage strips. In the latter case the data agreed satisfactorily with theory. Drainage strips were found to reduce the extent of holdup significantly.

Copyright © 1986 by ASME
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