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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

LUMPED PARAMETER ANALYSIS OF TWO-PHASE FLOW INSTABILITIES

Get access (open in a dialog) DOI: 10.1615/IHTC7.4420
pages 213-218

Abstract

A numerical model is developed to predict both the steady state and transient behavior of forced-convection boiling two-phase flow in a single channel. The model is based on the assumption of homogeneous two-phase flow and thermodynamic equilibrium of the two phases.Compressibility effects in the two-phase region, motion of the bulk boiling interface and the thermal capacity of the heater wall have been included in the analysis. The model is used to study the effects of heat input, inlet subcooling and flow rate on the system behavior. For comparison purposes, an experimental investigation was conducted using a single channel, electrically heated, forced-convection upflow system. Steady state operating characteristics and stable and unstable regions are determined as a function of heat flux, inlet subcooling and mass flow rate. Different modes of oscillations and their characteristics have been investigated. The predictions of the model are in good agreement with the experimental results.