Study of Thermal and Hydrodynamic Processes Associated with Melting of Horizontal Substrate

摘要

The aim of the present study is to show how Taylor instability may govern the heat transfer from a liquid pool to a melting horizontal surface lying underneath, when the melt density is less than the density of the pool. Understanding of such a physical process is essential to obtain better evaluation of certain types of hypothetical accidents in liquid metal fast breeder reactors. In postulating a hypothetical core disruptive accident a scenario may be imagined where a layer of liquid UO2 is formed on a horizontal steel surface. The removal of molten steel from underneath of denser liquid UO2 would be governed by Taylor instability as long as a UO2 crust does not separate liquid UO2 and steel surface. In this study a situation where the ratio of the density of the overlaying liquid to the melt density is of the same order as it would be in UO2 - steel combination, is created by forming a pool of warm water over a slab of frozen olive oil.