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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

HEAT TRANSFER IN MIXED CONVECTION OF SUPERHEATED STEAM FLOWING UPWARD IN TUBES

Get access (open in a dialog) DOI: 10.1615/IHTC13.p15.110
10 pages

Abstract

An experiment of heat transfer to superheated steam has been carried out in vertical tubes of D = 6, 12 and 20 mm with heated upward flow, covering the range of pressure of 0.2 to 6.2 MPa, Reynolds number of 3000 to 115000 and Grashof number of up to 1.2×108. The mixed convection exhibits a substantial impairment in heat transfer due to the effect of buoyancy. The onset of impairment is strongly dependent on the pressure and diameter, and for higher pressure and/or larger diameter it could occur at rather high Reynolds number (>24000). Due to lack of appropriate prediction method, a modified correlation is attempted for calculation of the heat transfer in mixed convection.