Forced Convection Condensation on a Horizontal Tube—Experiments With Vertical Downflow of Steam

[+] Author and Article Information
A. G. Michael, J. W. Rose

Department of Mechanical Engineering, Queen Mary College (University of London), London E1 4NS United Kingdom

L. C. Daniels

Heat Transfer and Fluid Flow Service (HTFS), Thermal Hydraulics Division, Harwell Laboratory, Oxfordshire OX11 0RA United Kingdom

J. Heat Transfer 111(3), 792-797 (Aug 01, 1989) (6 pages) doi:10.1115/1.3250753 History: Received November 05, 1987; Online October 20, 2009


The paper reports an experimental investigation into the condensation of steam flowing vertically downward over a single horizontal tube. A limited number of experiments with steam-nitrogen mixtures are also reported. For the case of “pure” steam, data have been obtained at near atmospheric pressure for vapor approach velocities in the range 5 to 81 m/s and with superheats in the range 2 to 40 K. The results are compared with theory and earlier experimental data for steam and other fluids. The vapor-side heat transfer coefficients were found to increase with velocity. For vapor velocities in excess of 30 m/s, the rate of increase of the vapor-side coefficient was greater than predicted by laminar condensate flow theory. This behavior has also been observed by earlier workers for refrigerant-113 and ethylene glycol and may indicate onset of turbulence in the condensate film. Superheat had insignificant effect on the heat transfer coefficient for the condensate film. The results for steam-nitrogen mixtures were generally in good agreement with existing equations for the “gas-layer” resistance.

Copyright © 1989 by ASME
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