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2.9 Critical Flow of Flashing Water through Long Tubes

DOI: 10.1615/ICHMT.1982.AdvCourHeatTransfNucReactSaf.210
pages 409-419

Jean-Marie Seynhaeve
Institute of Mechanics, Materials and Civil Engineering (iMMC), Universite Catholique de Louvain (UCL), 1348 Louvain-la-Neuve, Belgium

M. Giot
Unite Thermodynamique et Turboinachines, Universite Catholique de Louvain Place du Levant 2 ?-1438 Louvain-la-Neuve, Belgium

Abstract

Several models have been proposed to calculate critical flow-rates. Our experimental data on critical flow of flashing water through long tubes show poor agreement with these models except by one : Lackme's model, which has been recently established.
This model considers that the flashing liquid flow is made up of satured and superheated liquid. It enables to determine not only the value of the critical flow-rate, but also the values of the flow parameters at the critical section.
In this paper comparisons with our experimental data are given and it is shown that LacKme's model is a promising tool for safety analysis of nuclear plants, and, more generally, for design engineering.

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