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International Heat Transfer Conference 6

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

CRITICAL HEAT FLUX IN FLOW BOILING

Geoffrey F. Hewitt
Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK

DOI: 10.1615/IHTC6.2430
pages 143-171

Abstract

Recent results for critical heat flux in flow boiling are reviewed in the areas of simple geometries (ie round tubes), more complex geometries (ie annuli, rod bundles etc), in situations of flow-reversal and for non-aqueous fluids. The results are also discussed for non-vertical channels and the way in which these results differ from those obtained from vertical channels are evaluated. Work on the mechanism of burnout is then discussed for the subcooled (and low quality) region and for the annular region respectively. The relationship between critical heat flux and pressure gradient is reviewed and the mechanisms occurring in non-vertical channels are discussed. Next, methods for the prediction of critical heat flux are reviewed. These include a wide variety of empirical correlations and also prediction methods based on modelling of a specific flow regime (eg annular flow). Finally, future trends and requirements in research in this area are discussed.

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