On Rayleigh - Taylor instability in heated liquid-gas and liquid-vapor systems

L.G. Badratinova, P. Colinet, M. Hennenberg, J.C. Legros

Russ. J. Eng. Thermophys., Vol. 6, No. 1, 1996, pp. 1-31.

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The influence of the thermocapillary and phase change effects on the Rayleigh-Taylor instability of a heated two-layer system has been studied. For a system heated from the bottom the formulas have been derived for a critical gas or vapor layer thickness below which the Rayleigh-Taylor instability is affected by thermal effects. In a system with a very thin gas layer the Rayleigh-Taylor instability is replaced by the thermocapillary one if the heated flux, transferred from the bottom wall, is sufficiently high. A motionless state of a very thin vapor layer can be stabilized by the phase change effect. Thermocapillary oscillatory instability has been found for large gas layer depths.