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International Heat Transfer Conference 10

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

FLOW INSTABILITY AND CRITICAL HEAT FLUX IN A RIBBED ANNULUS

B.W. Yang
Columbia University, New York, NY

T. Dougherty
Columbia University, New York, NY

C. Fighetti
Columbia University, New York, NY

S. Kokolis
Columbia University, New York, NY

G.D. Reddy
Columbia University, New York, NY

Edward V. McAssey, Jr.
Villanova University, Villanova, PA, USA

A. Coutts
Westinghouse Savannah River Co., Aiken, SC

Abstract

An experimental program has been conducted to determine the onset of flow instability point in a heated annulus, which is divided into four sub channels by non-conducting ribs. The onset of flow instability is identified by the minimum point in the pressure drop-velocity curve. Comparisons with a ribless annulus show that the presence of ribs increases the minimum point velocity. In addition, data are presented which show that under certain conditions premature CHF can be induced by the ribs.

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