Analysis of critical and subcritical flow boiling

Low pressure flow boiling has been computer-simulated by means of the Homogeneous Equilibrium Mixture (HEM) and algebraic slip model of two-phase flow using a transient computer code. Numerical difficulties were experienced when the two-phase velocity exceeded the HEM model's speed of sound at...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1993, Vol.36 (15), p.3813-3822
Main Authors: Lyczkowski, R.W., Domanus, H.M., Bottoni, M., Sha, W.T.
Format: Article
Language:English
Subjects:
Applied sciences
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fission nuclear power plants
Installations for energy generation and conversion: thermal and electrical energy
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Summary:Low pressure flow boiling has been computer-simulated by means of the Homogeneous Equilibrium Mixture (HEM) and algebraic slip model of two-phase flow using a transient computer code. Numerical difficulties were experienced when the two-phase velocity exceeded the HEM model's speed of sound at the inception of boiling during the solution procedure. An apparent anomaly experienced was the calculation of pressure undershoots (‘kinks’) across a two-phase boiling region surrounded by single-phase subcooled liquid. It is clearly shown that the HEM model's speed of sound is a critical state for the evaluation of the pressure gradient. When this speed of sound is not exceeded at the inception of boiling, numerically stable and accurate results are computed. Some means of resolving these apparently fundamental and generic problems are suggested.
ISSN:0017-9310
1879-2189
DOI:10.1016/0017-9310(93)90061-A