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ISSN Online: 2377-424X

ISBN Print: 0-89116-299-2

International Heat Transfer Conference 7
September, 6-10, 1982, Munich, Germany

BOILING HEAT TRANSFER IN ANNULAR FLOW

Get access (open in a dialog) DOI: 10.1615/IHTC7.940
pages 193-199

Resumo

This paper describes experiments aimed at elucidating the mechanism of heat transfer in annular flow. The aim was to distinguish between the conventional explanation of a purely convective mechanism at high qualities and the alternative hypothesis by Mesler [2] in which nucleate boiling heat transfer is enhanced by film thinning in the high quality region. To avoid ambiguities in local hydrodynamic conditions the tests were designed to give heat transfer coefficient measurements at constant quality and film flow. It was found that the heat transfer coefficient varied only with quality and not with heat flux, indicating the absence of a nucleate-boiling type behaviour. The heat transfer coefficients were generally below those predicted from film flow theory, particularly at high quality. This discrepancy is as yet unexplained, but the same discrepancy is found in other forced convective data. Thus, the present data is in reasonable agreement with existing correlations for forced convective two phase heat transfer.