RESEARCH PAPERS: Boiling and Two-Phase Heat Transfer

Analytical Study of Critical Heat Flux in Two-Phase Thermosyphon: Relationship Between Maximum Falling Liquid Rate and Critical Heat Flux

[+] Author and Article Information
M. Monde

Department of Mechanical Engineering, Saga University, 1 Honjo Saga, Japan 840

J. Heat Transfer 118(2), 422-428 (May 01, 1996) (7 pages) doi:10.1115/1.2825861 History: Received April 01, 1995; Revised December 01, 1995; Online December 05, 2007


An analytical study has been done on the critical heat flux of a two-phase thermosyphon, in which a liquid film and a vapor flow exist in a countercurrent annular flow. The CHF point on the thermosyphon is proved to correspond to a maximum falling liquid rate fed to the thermosyphon, which can be determined from three equations of momentum, its partial derivative with void fraction, and mass balance in the thermosyphon. This maximum point, furthermore, becomes identical to the point at which an envelope line generated from the momentum equation and its partial derivative intersects the mass balance line. The CHF calculated from the maximum liquid rate is found to be in fairly good agreement with the existing CHF data.

Copyright © 1996 by The American Society of Mechanical Engineers
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