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International Heat Transfer Conference 5

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

EXPERIMENTAL STUDY OF THE EFFECT OF ARTIFICIAL ROUGHNESS ON POST-DRYOUT HEAT TRANSFER

M. A. Styrikovich
Institute of High Temperature, Korovinskoye Road, USSR Academy of Sciences Moscow, 127412 Moscow 1-412, USSR

V. S. Polonsky
Institute of High Temperature of the USSR Academy of Sciences, Moscow

DOI: 10.1615/IHTC5.370
pages 145-149

Abstract

This paper presents the results of an experimental study on the effect of surface roughness on the post-dryout heat transfer of a 137 bar steam-water mixture at mass velocity ρW = 880-1000 kg/m2sec and heat flux q = 580-655 kW/m2. The artificial roughness height was 50-100 microns and its pitch ~ 2000 microns; the roughness caused by CaSO4 deposits featured the maximum height of 40 microns. It has been shown that the temperature difference was reduced by artificial roughness by 90-150 C, and by CaS04 deposits - from 150-170 C. to 10-30 C.

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