Forced Convection Condensation of Steam on a Small Bank of Horizontal Tubes

[+] Author and Article Information
A. G. Michael

Rein Haus (Cyprus) Ltd., Larnaca, Cyprus

W. C. Lee

Polytechnic of Central London, Faculty of Engineering and Science, London, United Kingdom

J. W. Rose

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

J. Heat Transfer 114(3), 708-713 (Aug 01, 1992) (6 pages) doi:10.1115/1.2911338 History: Received April 01, 1991; Revised February 01, 1992; Online May 23, 2008


Heat transfer measurements are reported for condensation of steam flowing vertically downward over a small bank of staggered horizontal tubes having 10 rows with 4 and 3 tubes per row. The tubes in each row were connected in series and separately supplied with cooling water. The cooling water flow rate and temperature rise were measured individually for each row and tube-wall temperatures were measured on selected tubes. Data were obtained at slightly above atmospheric pressure and the range of steam approach velocity (based on the cross-sectional area of the duct) was 6 to 23 m/s. A general trend of decreasing heat transfer coefficient with depth in the bank was found. However, superimposed on this was a “saw-tooth” effect with the three-tube rows having higher coefficients than the rows with four tubes. The amplitude of the coefficient variation decreased down the bank and was also less pronounced at lower vapor velocities. When compared with other experimental data for condensation of steam on small staggered banks, the present data exhibit somewhat higher vapor-side, heat transfer coefficients.

Copyright © 1992 by The American Society of Mechanical Engineers
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