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强化传热期刊
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ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v4.i4.40
pages 283-296

Two Phase Flow Patterns and Boiling Heat Transfer in Tubes Containing Helical Wire Inserts --Part II - Critical Heat Flux Studies

J. Lan
College of Engineering, University of Cincinnati, Cincinnati, OH 45221-0072
Peter J. Disimile
Department of Aerospace Engineering, University of Cincinnati, Cincinnati, OH, USA 45221-0070
J. Weisman
Department of Chemical & Nuclear Engineering University of Cincinnati, Cincinnati, Ohio

ABSTRACT

Critical heat flux (CHF) experiments with refrigerant 113 were conducted in a vertical round tube using two different helical wire inserts. The data indicated the critical heat fluxes to be significantly above those seen in smooth tubes over an appreciable velocity range. The mass velocity at which CHF enhancement is first observed appears to coincide with the onset of swirling flow at the periphery of the heater tube. Based on the present and literature data, a tentative correlation is suggested for the degree of CHF enhancement under subcooled conditions.


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