Radiation heat transfer from a spherical particle via vapor shell to the surrounding liquid

A numerical analysis is made of different conditions of radiation heat tran sfer from a hot spherical particle via vapor shell to the surrounding liqui d. In the case of the vapor shell thickness comparable with the heat radiat ion wavelength, wave effects are included which result in a considerable in crease of the heat Aux. For a great thickness of the shell, the problem is solved using the Mie theory for the particle emissivity, Fresnel formulas f or refraction and reflection of radiation on the liquid surface, and the eq uation of radiation transfer for the calculation of radial distribution of the pourer of absorbed radiation. Recommendations are given for approximate inclusion of radiation heat transfer in the calculations of interaction be tween molten core particles and water as applied to studies into possible v apor explosion under conditions of a severe accident in a nuclear reactor.