Visualization of molecular motion in rarefied gas flows by direct simulation of Monte Carlo method

Abstract

Rarefied gas flows through a channel or a circular tube were simulated by direct simulation Monte Carlo method (abbreviated to DSMC method, hereafter). Solid walls with condensation are installed in the flows. The motion of gas molecules are visualized by the numerical results of the DSMC method. The transimision probability of gas molecules through the circular tube with the ratio of length to diameter, 1, arn almost 39% even if the inner wall of the circular tube are a perfect condensation wall.