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本文提出了一种新模型来研究液层在其纯蒸气中的蒸发热动力学特征,尤其是当蒸发界面张力驱动流占主导作用时(如微重力环境中)液层热毛细对流和界面蒸发始终耦合在一起。气-液界面的传热传质规律有待深入研究。本文数值模拟研究了蒸发相变界面热毛细对流与蒸发效应的耦合机质,得到了不同蒸发模式和不同强度热毛细对流蒸发液层的温度分布、蒸发速率以及对流流场分布的数值解。论述了蒸发Biot数和Marangoni数对界面传热传质的影响,发现并解释了蒸发和热毛细耦合的三种模式。
In this paper, a new model is proposed to study the thermodynamic characteristics of vaporization of the liquid layer in its pure vapor, especially when the enthalpy of evaporative interfacial tension drive (such as in the microgravity environment), the thermocapillary convection and interface evaporation Always coupled together. Gas-liquid interface heat and mass transfer rules need further study. In this paper, the numerical simulation of the coupling mechanism of the thermocapillary convection and evaporation in the vapor phase transition interface was carried out, and the numerical solutions of the temperature distribution, the evaporation rate and the convection flow field were obtained for different evaporation modes and different intensities. The effects of Biot number and Marangoni number on the heat and mass transfer of interface were discussed. Three modes of evaporation and thermo-capillary coupling were found and explained.