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International Heat Transfer Conference 6

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

THE EFFECT OF INLET SUBCOOLING ON SUSTAINED AND TRANSIENT BOILING FLOW INSTABILITIES IN A SINGLE CHANNEL UPFLOW SYSTEM

Sadik Kakac
Department of Mechanical Engineering,TOBB University of Economics and Technology, Ankara-Turkey; and LIPING CAO, Westinghouse Electric Company, LLC, PA; and Department of Mechanical Engineering, University of Miami, Florida - USA

T. Nejat Veziroglu
University of Miami, Miami, FL

H. S. Ergur
Middle East Technical University, Ankara, Turkey

I. Ucar
Middle East Technical University, Ankara, Turkey

DOI: 10.1615/IHTC6.720
pages 363-368

Abstract

In this study, the effect of inlet subcooling on sustained and transient boiling flow instabilities induced by forced convection in a heated single channel upflow system has been experimentally investigated by using Freon-113 and Freon-11 as the test fluids. Two major modes of oscillations, i.e., density-wave and pressure-drop types have been identified. Stable and unstable regions have been determined in system pressure-drop versus mass flow rate planes for various values of inlet fluid temperature. Stability and instability boundaries at each constant heat flux are obtained on a mass flow rate versus inlet subcooling plane. Transient instabilities resulting from a step increase in power input and a step decrease in flow rate at various values of inlet subcooling have also been investigated.

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