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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Molecular gas dynamics approaches to interfacial phenomena accompanied with condensation
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Molecular gas dynamics approaches to interfacial phenomena accompanied with condensation

机译：伴随凝结的界面现象的分子气体动力学方法

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This paper deals with the condensation coefficient of methanol, which is evaluated from a condensation rate at the vapor-liquid interface. Film condensation is induced on the endwall of a vapor-filled shock tube, when a shock wave is reflected at the endwall and the vapor becomes supersaturated there. The liquid film grows with the lapse of time. The evolution in time of the liquid film thickness is measured by an optical interferometer with a high accuracy, and thereby the net condensation mass flux at the interface is obtained. The mass flux is incorporated into the kinetic boundary condition (KBC) at the interface for the Gaussian-BGK Boltzmann equation. Such a treatment of the boundary condition makes it possible to formally eliminate the evaporation and condensation coefficients in KBC and to obtain the unique numerical solution of the vapor-liquid system. In this way, the instantaneous condensation coefficient is accurately evaluated from the conformity with experiment and numerical solution. It is found that the values of condensation coefficient are, near vapor-liquid equilibrium states, close to those evaluated by molecular dynamics simulations. (C) 2006 Published by Elsevier Inc.
机译：本文讨论了甲醇的缩合系数，该系数是根据气-液界面处的缩合率估算的。当冲击波在端壁处反射并且蒸汽在那里变得过饱和时，在充满蒸汽的冲击管的端壁上会引起薄膜凝结。液膜随着时间的流逝而增长。用光学干涉仪高精度地测量液膜厚度的时间变化，从而获得界面处的净冷凝质量通量。质量通量在高斯BGK玻尔兹曼方程的界面处并入动力学边界条件（KBC）。边界条件的这种处理使得可以正式消除KBC中的蒸发系数和冷凝系数，并获得气液系统的唯一数值解。这样，根据与实验和数值解的符合性，可以准确地评估瞬时凝结系数。发现缩合系数的值接近气液平衡状态，接近于通过分子动力学模拟评估的值。 （C）2006由Elsevier Inc.出版

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