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International Heat Transfer Conference 8

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

THE EFFECT OF LIQUID SUBCOOLING AND TUBE LENGTH ON THE TWO-PHASE CRITICAL FLOW IN TUBES AND FLOW IN THE JET

Flavio Dobran
Stevens Institute of Technology Hoboken, N.J. 07030 U.S.A.

DOI: 10.1615/IHTC8.4650
pages 2301-2306

Abstract

The critical two-phase flow discharge through a tube and flow in the jet expansion region on the outside of the tube depend on the subcooling of the liquid in the vessel to which the tube is attached and on its length and diameter. The results from nonequilibrium modeling of the critical two-phase flow in tubes and flow in the jet expansion region are presented for different liquid stagnation conditions and tube geometric characteristics. It is shown that an increase in the subcooling of liquid in the vessel and a decrease in the tube length produces greater nonequilibrium effects at the tube exit and in the jet when compared to the critical flow discharge of saturated liquid through long pipes. The liquid phase in the jet has a tendency to remain close to the jet axis and the flow properties to exhibit steep gradients in the axial and radial flow directions. The results are compared with the experimental data of saturated and subcooled liquid discharge through variable length tubes and flow in the jet and this comparison is shown to be very reasonable.

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