Liquid temperature dependence of kinetic boundary condition at vapor-liquid interface
Liquid temperature dependence of kinetic boundary condition at vapor-liquid interface
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DOI：
10.1016/j.ijheatmasstransfer.2016.03.088
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发表时间：
2016-08-01
影响因子：
5.2
通讯作者：
Watanabe, Masao
中科院分区：
文献类型：
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作者：
Kon, Misaki;Kobayashi, Kazumichi;Watanabe, Masao
为了准确描述汽液界面的传热传质过程，在非平衡相变（净蒸发/冷凝）过程中对界面进行适当的建模是一个至关重要的问题。本研究的目的是提出一个微观界面模型，应施加在界面上的动力学边界条件的玻尔兹曼方程。本文基于平均场动力学理论，构造了单原子分子在较宽温度范围内的动力学边界条件，并通过求解Boltzmann方程的边值问题验证了所构造的动力学边界条件的准确性.结果表明，通过简单设定液相温度，可以在界面处施加动力学边界条件，模拟由净蒸发/冷凝引起的复杂汽液两相流动。此外，我们将构造的动力学边界条件应用于流体动力学型方程的边界条件。这一应用使我们能够处理一个大的时空尺度的界面动力学的汽液两相系统与净蒸发/冷凝。(C)2016爱思唯尔有限公司版权所有。
For the accurate description of heat and mass transfer through a vapor-liquid interface, the appropriate modeling of the interface during nonequilibrium phase change (net evaporation/condensation) is a crucial issue. The aim of this study is to propose a microscopic interfacial model which should be imposed at the interface as the kinetic boundary condition for the Boltzmann equation. In this study, we constructed the kinetic boundary condition for monoatomic molecules over a wide range of liquid temperature based on mean field kinetic theory, and we validated the accuracy of the constructed kinetic boundary condition by solving the boundary value problem of the Boltzmann equation. These results showed that we can impose the kinetic boundary condition at the interface by simply specifying liquid temperature and simulate the complex vapor-liquid two-phase flow induced by net evaporation/condensation. Furthermore, we applied the constructed kinetic boundary condition to the boundary condition for the fluid-dynamic type equations. This application enables us to deal with a large spatio-temporal scale of the interfacial dynamics in the vapor-liquid two-phase system with net evaporation/condensation. (C) 2016 Elsevier Ltd. All rights reserved.