对蒸发曳力模型的修正

Improvements of Evaporation Drag Model

建立了一套研究高温小球落水的工程热物理基础实验装置。在此装置上进行了一系列实验,证实 了蒸发曳力模型的可信性,同时也发现其局限性。对蒸发曳力模型进行了修正,增加考虑了辐射热在液体内 部和汽液交界面的分布及对流换热对小球落水阻力的影响,扩大了蒸发曳力模型的适用性。

A special observable experiment facility is established, and a series of experiments are carried out on this facility by pouring one or several high-temperature particles into a water pool. The experiment verifies the evaporation drag model, which believe the non-symmetric profile of the local evaporation rate and the local density of the vapor would bring about a resultant force on the hot particle so as to resist its motion. However, in Yang's evaporation drag model, radiation heat transfer is taken as the only way to transfer heat from hot particle to the vapor-liquid interface and all of the radiation energy is deposited on the vapor-liquid interface, thus contributing to the vaporization rate and mass balance of the vapor film. So, the heat conduction and the heat convection are taken into account in improved model. At the same time, the improved model given by this paper presented calculations of the effect of hot particles temperature on the radiation absorption behavior of water.