Kinetic boundary condition at a vapor-liquid interface
Kinetic boundary condition at a vapor-liquid interface
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DOI：
10.1103/physrevlett.95.084504
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发表时间：
2005-08-19
影响因子：
8.6
通讯作者：
Fujikawa, S
中科院分区：
文献类型：
--
作者：
Ishiyama, T;Yano, T;Fujikawa, S
通过分子动力学模拟，发现Boltzmann方程在汽-液界面处的边界条件是三个一维Maxwell分布的乘积，其中三个一维Maxwell分布的蒸气分子速度分量和一个因子包括一个定义明确的冷凝系数。垂直于界面的速度分量的麦克斯韦分布的特征在于液体温度，如在常规模型边界条件中，而切向分量的麦克斯韦分布由不同的温度规定，该温度是跨界面的能通量的线性函数。发现冷凝系数是常数，并且等于仅由液体温度确定的蒸发系数。
By molecular dynamics simulations, the boundary condition for the Boltzmann equation at a vapor-liquid interface is found to be the product of three one-dimensional Maxwellian distributions for the three velocity components of vapor molecules and a factor including a well-defined condensation coefficient. The Maxwellian distribution for the velocity component normal to the interface is characterized by the liquid temperature, as in a conventional model boundary condition, while those for the tangential components are prescribed by a different temperature, which is a linear function of energy flux across the interface. The condensation coefficient is found to be constant and equal to the evaporation coefficient determined by the liquid temperature only.