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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

THE EFFECT OF INLET SUBCOOLING AND HEAT TRANSFER ENHANCEMENT ON TWO-PHASE FLOW PRESSURE-DROP TYPE AND THERMAL INSTABILITIES

Get access (open in a dialog) DOI: 10.1615/IHTC9.4430
pages 107-112

Аннотация

This work covers experimental and theoretical investigations of thermal instabilities in forced convection boiling in a vertical single channel system, with Freon-11 as the working fluid. Experiments have been carried out with tubes of several diameters and with various surface augmentations, at constant fluid inlet temperature and different heat inputs, and also with different inlet fluid temperatures at constant heat inputs. Under the experimental conditions of this study, pressure-drop type and thermal oscillations, as well as pressure-drop type oscillations with superimposed density-wave oscillations, have been observed. Effects on the instabilities of the inlet subcooling and of the heat transfer surface augmentation have been studied. A homogeneous two-phase flow model with the assumption of thermal equilibrium has been developed to predict the steady-state characteristics and the dynamic behavior of the forced convective flow in the channel.