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ISSN Online: 2377-424X

ISBN Print: 0-89116-909-1

International Heat Transfer Conference 9
August, 19-24, 1990 , Jerusalem, Israel

INTERPHASE HEAT TRANSFER IN NONSTATIONARY VAPOUR-LIQUID FLOWS

Get access (open in a dialog) DOI: 10.1615/IHTC9.2130
pages 317-322

要約

The effect of interphase heat transfer occurring in a vapour-liquid flow at its dynamic perturbation on the character and mechanisms of pressure perturbation evolution is considered. It has been shown for a bubbly vapour-liquid mixture that the determination of heat flux from vapour to liquid, which is sensitive to the profile of pressure wave is the crucial point in describing the interphase heat and mass transfer. It has been shown that in high-amplitude perturbations the intensity of the process of vapour bubble condensation can be so high that this process will be completed in the perturbation front. This can lead to an essential increase in the amplitude of initial pressure wave.
It has been shown for the case of a slug vapour-liquid flow that the duration of perturbation front is the determining factor in constructing the models of interphase heat transfer. The thre-shold duration, at which the heat transfer law can be based on stationary model, is determined. Experimental data obtained on the behaviour of vapour slugs in pressure waves are satisfactorily described in the frame of this model. It has been shown that pulse increase in the amplitude of initial pressure perturbation occurs as a result of a rapid condensation of the slug, its destruction and cumulative jet effect.