Rarefied Compressible Two-Dimensional Jet Plume Impingement on a Flat Plate

In this paper, we investigate rarefied jet gas flows out of a two-dimensional slit and impinges on a flat plate which is set vertically to the plume flow direction. With a relation between velocity-directions and geometry-positions, we obtain several analytical collisionless flow property distributions in front of the plate. This study further provides near-plate collisionless flow properties including density, slip velocity, temperature, pressure, shear stress and heat flux. Numerical simulation results obtained with the direct simulation Monte Carlo method validate the analytical collisionless flow solutions. In general, the comparisons between the exact analytical solutions and the numerical ones are virtually identical. Further, the analytical results, which are derived for the collisionless flow situation, are applicable for finite Knudsen number in the range Kn ≥ 1. These analytical results can provide first order predictions for engineering applications with minor inaccuracies.