Flow Excursion-Induced Dryout at Low Heat Flux Natural Convection Boiling

[+] Author and Article Information
M. Khatib-Rahbar, E. G. Cazzoli

Department of Nuclear Energy, Brookhaven National Laboratory, Upton, NY 11973

J. Heat Transfer 108(2), 425-432 (May 01, 1986) (8 pages) doi:10.1115/1.3246941 History: Received May 02, 1983; Online October 20, 2009


Flow excursion-induced dryout at low heat flux natural convection boiling, typical of liquid metal fast breeder reactors, is addressed. Steady-state calculations indicate that low-quality boiling is possible up to the point of the Ledinegg instability, leading to flow excursion and subsequent dryout in agreement with experimental data. A flow regime-dependent critical heat flux relationship based upon a saturated boiling criterion is also presented. Transient analyses indicate that premature flow excursion cannot be ruled out and the boiling process is transient dependent. Analysis of a loss-of-flow transient at high heat flux forced convection shows a significantly faster flow excursion leading to dryout, which is in excellent agreement with the results of the two-dimensional THORAX code.

Copyright © 1986 by ASME
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