Heat Transfer Research

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Allowance for the Dynamics of a Vapor Bubble in Calculation of Thermal Interaction of a Hot Spherical Particle with Surrounding Water

Leonid A. Dombrovsky
1 Joint Institute for High Temperatures, Krasnokazarmennaya 17A, 111116, Moscow, Russia

L. I. Zaichik
Institute for High Temperatures of the Russian Academy of Sciences, Krasnokazarmennaya 17a, 111116 Moscow, Russia

ABSTRACT

A nonstationary problem of thermal interaction of a hot spherical particle and surrounding water is being solved for conditions of heavy accident at a nuclear reactor. In calculation of heat transfer through a vapor gap thermal radiation of a particle is taken into account. For the initial stage of interaction, an analytical solution is obtained in isobaric approximation; comparison with a full numerical solution has shown that oscillations of vapor pressure and vapor-gap thickness do not influence mean parameters of heat transfer from a particle to water. Results of the damping effect of thermal radiation of a particle on oscillations of particle vapor envelope are obtained. Possible destruction of a melt drop under the influence of pressure fluctuations in the vapor gap is evaluated and the size of a drop is determined at which its further destruction is impossible.