STAGNATION-POINT FLOW OF A RAREFIED GAS IMPINGING OBLIQUELY ON A PLANE WALL

摘要

The steady two-dimensional stagnation-point ow of a rareed gas impinging obliquely on an in nitely wide plane wall is investigated on the basis of kinetic theory. Assuming that the overallow field has a length scale of variation much longer than the mean free path of the gas molecules and that the Mach number based on the characteristicow speed is as small as the Knudsen number (the mean free path divided by the overall length scale of variation), one can exploit the result of the asymptotic theory (weakly nonlinear theory) for the Boltzmann equation, developed by Sone, that describes general steady behavior of a slightly rareed gas over a smooth boundary [Y. Sone, in: D. Dini(ed.) Rareed Gas Dynamics, Vol. 2, pp. 737{749. Editrice Tecnico Scientica,Pisa (1971)]. By solving the uid-dynamic system of equations given by the theory, the precise description of the velocity and temperature fields around the plane wall is obtained.