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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

TWO-PHASE BUBBLY FLOW THROUGH A CONVERGENT-DIVERGENT NOZZLE WITH INTERPHASE HEAT AND MASS TRANSFER

Get access (open in a dialog) DOI: 10.1615/IHTC9.4260
pages 3-8

摘要

A physical model for one-dimensional, steady, two-phase, two-component, bubbly flow of water + steam + gas mixtures through convergent-divergent nozzles is presented. The mathematical analysis allows momentum and thermal lags between the gaseous and liquid phases as well as mass transfer to the host phase due to condensation. Pressure losses caused by friction at the nozzle walls are also accounted for. The analysis reveals that, under appropriate conditions, similar to compressible gas behaviour, supersonic flow can be achieved in the divergent section of the nozzle, while the two-phase mixture expands to the ambient pressure. The parametric investigation indicates a significant decrease in the achievable exit flow velocity due to friction. Interphase heat transfer is shown to dominate the bubble temperature variation and the condensation process of vapor-containing bubbles. However, in the configuration studied, both thermal equilibrium and complete condensation of the vapor content take place within the initial part of the nozzle, resulting in only minor effects of the sensible enthalpy and the vapor content of the bubbles on the exit flow velocity.