In this study the equations of motion derived by von Karman (1), with Benton’s transformations (2) for the flow over a single free disk is studied for the slip flow. The slip regime for the Knudsen number (Kn) is valid in the range $0.1>Kn>0.01$ (3). For $Kn<0.01$ the no-slip condition is present and for $Kn>0.1$ the Navier–Stokes equations cannot be used since the flow field cannot be assumed to be continuum. In our study, the slip and the no-slip regimes that lie in the range $0.1>Kn>0$ is considered.

The subject of the rarefied gas dynamics can be conveniently defined as the study of gas flows in which the average value of the distance between two subsequent collisions of a molecule, namely the mean free path, is not negligible in comparison...