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RESEARCH PAPERS

A Nonequilibrium Vapor Generation Model for Flashing Flows

[+] Author and Article Information
P. Saha

Department of Nuclear Energy, Brookhaven National Laboratory, Upton, N.Y. 11973

N. Abuaf

Research and Development Center, General Electric Co., Schenectady, N.Y. 12301

B. J. C. Wu

Lawrence Livermore National Laboratory, Livermore, Calif. 94550

J. Heat Transfer 106(1), 198-203 (Feb 01, 1984) (6 pages) doi:10.1115/1.3246634 History: Received June 07, 1982; Online October 20, 2009

Abstract

A nonequilibrium vapor generation model for flashing flows is presented. The model consists of a flashing inception point, a bubbly flow regime followed by a bubbly-slug regime, an annular or annular-mist regime, and finally a dispersed-droplet regime. Existence of superheated liquid at the inception point and beyond is recognized. The vapor generation rate is calculated from the flow-regime dependent interfacial area density and net interfacial heat flux. However, the bubble number density at the flashing inception point was varied to obtain optimum fits with the void fraction data taken in a vertical converging-diverging nozzle. The interfacial area density at the inception point, thus determined, showed a rapid increase with the decrease in the liquid superheat at that point. This trend is plausible, since in the limit of thermal equilibrium flow where the liquid superheat approaches zero, the interfacial area for heat and mass transfer should be very large.

Copyright © 1984 by ASME
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