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International Heat Transfer Conference 5

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

SUSTAINED AND TRANSIENT BOILING FLOW INSTABILITIES IN A CROSS-CONNECTED FOUR-PARALLEL-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

K. Akyuzlu
Middle East Technical University, Ankara, Turkey

0. Berkol
Middle East Technical University, Ankara, Turkey

Abstract

In this study, the stability conditions and the modes of oscillation in a four parallel-channel upflow boiling system with cross-connections have been experimentally investigated using Freon-11 as the test fluid. Two major modes of oscillation, namely density-wave and pressure-drop type oscillations, have been observed. When two modes of oscillation occurred simultaneously some temperature oscillations were observed in most instances. Transient instabilities resulting from a step increase in power input and a step decrease in flow rate have also been investigated. The results have been compared with other boiling flow systems.

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