Rarefied gas flow through a rough channel of finite length into a vacuum was investigated using the direct simulation Monte Carlo method. The non-equilibrium effects at the input and output of the channel were considered by including certain pre-and post-channel regions into the geometry under consideration. The mass flow rate through a short and long channel was computed in a wide range of gas rarefaction from the free molecular regime to the hydrodynamic near. It is shown that the noticeable effect of surface roughness on flow rate is manifested in the free molecular and transition regimes. The analysis is provided for the flow field inside the channel as well as in the upstream and downstream regions. The results obtained are consistent with the theoretical, numerical, and experimental data available in the open literature.

使用直接模拟蒙特卡洛方法研究了通过有限长度的粗糙通道进入真空的稀薄气流。通过将某些前和后通道区域包括在所考虑的几何图形中，可以考虑通道输入和输出处的非平衡效应。从短分子通道到长通道的质量流率是在从稀少的分子态到流体动力学附近的稀薄气体中进行计算的。结果表明，表面粗糙度对流速的显着影响体现在自由分子和过渡态中。为通道内部以及上游和下游区域的流场提供了分析。获得的结果与公开文献中提供的理论，数值和实验数据一致。