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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

O. Berkol
Middle East Technical University, Ankara, Turkey

DOI: 10.1615/IHTC5.550
pages 235-239

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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