Slip model performance for micro-scale gas flows

The small length scale and bulk gas velocity associated with micro-scale gas flows make it difficult to simulate such flows using accurate and efficient computational methods. To address this problem, slip models have been proposed in the literature as a means to combine numerically efficient continuum flow solvers with corrected boundary conditions. The purpose of this investigation is to evaluate the performance of three popular slip models found in the literature. Analytical solutions using the slip models are compared to DSMC results for one-dimensional Couette and Poiseuille flow. The three slip models tested perform similarly well predicting the velocity profile and mass flux for a Knudsen number Kn 0.1.