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International Heat Transfer Conference 5

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

THE OCCURRENCE OF UPSTREAM DRY OUT IN UNIFORMLY HEATED CHANNELS

D. C. Groeneveld
Atomic Energy of Canada Limited, Chalk River Laboratories, Chalk River, Ontario, Canada K0J 1J0; Department of Mechanical Engineering, University of Ottawa, Ottawa, Ontario, Canada K1N 6N5

Abstract

At mass flows greater than 4000 kg/m2.s and qualities between 8% and 45%, dryout was observed in Freon-12 upstream from the outlet end of a uniformly heated tubular test section. Upstream dryout has also been observed during other high mass flow experiments: in Freon-12 in multi-rod bundles at the above conditions and in steam-water in tubes at Freon equivalent conditions. Upstream dryout is postulated to occur as a consequence of deterioration of the heat transport properties near the wall in the high mass velocity froth flow regime.

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