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RESEARCH PAPERS: Boiling and Condensation

Study on Critical Heat Flux in Rectangular Channels Heated From One or Both Sides at Pressures Ranging From 0.1 to 14 MPa

[+] Author and Article Information
Y. Sudo

Department of High Temperature Engineering, Tokai Research Establishment, Japan Atomic Energy Research Institute (JAERI),2-4 Shirakata-Shirane, Tokai-mura, Naka-gun, Ibaraki-ken 319-11 Japan

J. Heat Transfer 118(3), 680-688 (Aug 01, 1996) (9 pages) doi:10.1115/1.2822686 History: Received November 07, 1995; Revised May 15, 1996; Online December 05, 2007

Abstract

In this study, a quantitative analysis of critical heat flux (CHF) in rectangular heated channels was carried out based on new flow models and the analytical results were compared with existing experimental results at pressures of about 0.1 to 14 MPa with a water mass flux of 3.9 to 28,000 kg/m2 s and inlet water subcooling ranging from 0 to 328 K. The flow models proposed for CHF were a completely separated two-phase flow model with a macroliquid sublayer under conditions of comparatively low velocity and zero water subcooling at outlet of the channel and a subcooled boiling flow model with a macroliquid sublayer under the conditions of high water subcooling and high velocity, respectively. It could be shown that the analytical CHF results gave good predictions for over 800 existing experimental results, identifying the effects of predominant parameters as regards CHF.

Copyright © 1996 by The American Society of Mechanical Engineers
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