Abstract
The supersonic expansion of a heavy gas and a light gas may result in a velocity slip and a temperature difference between light and heavy species. The purpose of this paper is to study the influence of these phenomena on the relaxation of internal degrees of freedom in the free jet expansion of N_2-He mixture. We obtain the rotational temperature distribution of a supersonic free jet experimentally by electron beam fluorescence method, and compare it with the result of the numerical simulation by DSMC method.
