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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

THE INFLUENCE OF TUBE SPACING ON VAPOUR SHEAR IN CONDENSATION OF DOWNWARD FLOWING VAPOUR ON A ROW OF HORIZONTAL TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC9.3640
pages 27-31

Sinopsis

The paper describes the application of Honda and Fujii's method to the problem of vapour shear in condensation of a vertical downflow of steam. The configuration studied was a horizontal copper tube in a row of closely pitched tubes. The method has been modified to take correct account of property variations with temperature and release of sensible heat to the condensing film. Saturated steam conditions at 102°C were assumed with cooling water temperatures of 63 and 95°C.
The results show a marked increase of condensate film Nusselt number in the tube row and an increase with decrease in pitch:diameter ratio of the tubes. Graphs of Nusselt number variation round the tube wall, for different tube spacings, show high maxima before falling dramatically to Nusselt values beyond the separation point. Similar behaviour is exhibited by the heat flux density but is damped out by the heat transfer resistance on the cooling water side.