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Application of 2DMD to gaseous microflows

机译:2DMD在气态微流中的应用

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摘要

A two-dimensional molecular dynamics (2DMD) simulation is applied to gaseous microflows. Based on a velocity distribution function in equilibrium, the mean molecular speed, mean collision frequency, mean free path, and the dynamical viscosity are deduced theoretically. A Maxwell-type-like boundary condition for two-dimensional (2D) systems, which reveals a linear relationship between the slip length and the mean free path, is also derived. These expressions are consequently employed to investigate the rarefied gas flow in a submicron channel. The results show reasonable agreements with those by 3D simulations, and indicate that the 2DMD scheme can be very promising for the microflow researches because of its high efficiency in computation.
机译:二维分子动力学(2DMD)模拟应用于气态微流。根据平衡中的速度分布函数,理论推导了平均分子速度,平均碰撞频率,平均自由程和动态粘度。还导出了二维(2D)系统的类似麦克斯韦类型的边界条件,该边界条件揭示了滑移长度和平均自由程之间的线性关系。因此,这些表达式用于研究亚微米通道中的稀薄气流。结果表明与3D仿真的结果合理吻合,并且表明2DMD方案由于其高计算效率而对于微流研究具有非常大的前景。

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