热辐射计内稀薄气体流动的蒙特卡罗模拟

本文应用直接仿真蒙特卡罗(DSMC)方法,研究了Crookes热辐射计内由于叶片两表面的温度不同而引起的稀薄气体的流动,给出了热辐射计叶片高温面温度900K,低温表面温度为300 K,四种不同克努森数(Kn)下流速矢量场、温度场和叶片两面压力差的仿真结果.并与热辐射计在不同Kn数下的转速实验测量结果进行了比较,两者结果基本一致.

Direct simulation of Monte Carlo(DSMC) of rarefied gas flow in Crookes radiometer

A steady flow of rarefied gas induced around blades with unequal temperatures on its two surfaces within Crookes radiometer is investigated by the direct simulation Monte Carlo method. The blades have the 900 K temperature on one surface and 300 K on another surface. The simulation results of flow velocity field under four different Knudsen numbers and temperature fields under three different Knudsen numbers are presented and the pressure differences of the two surfaces of blade are given. These results are consistent with the experiment data. The properties of the gas flow are clarified for a wide range of the Knudsen number.