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International Heat Transfer Conference 4

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

A MODEL FOR PREDICTING THE ONSET OF OSCILLATORY INSTABILITY OCCURRING WITH THE INTERMIXING OF HIGH-VELOCITY VAPOR WITH ITS SUBCOOLED LIQUID IN COCURRENT STREAMS

William H. Westendorf
University of Cincinnati, Cincinnati, Ohio, United States Monsanto Research Corporation, Dayton, Ohio, United States

DOI: 10.1615/IHTC4.560
pages 1-11

Abstract

A semi-empirical approach, utilizing both basic heat transfer theory and the data of others (to estimate heat transfer coefficients) is used to develop the equations necessary to predict the points of onset of regular low-frequency oscillations. The equations lead to curves of condensing length as a function of coolant inlet temperature with mass flow rate ratio as the parameter. In addition to predicting the coolant temperature at which instability occurred, the model also predicted the condensing length (about 3 inches or 7.6 centimeters) at which oscillations began, thereby enhancing credibility of the model.

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