热辐射等效方法计算分子流状态下真空管道的传输几率  

Numerical Simulation of Transmission Probability for Molecular Gas Flow through Vacuum Pipe with Equivalent Heat Radiation Model

作　　者：张篁[1,2] 杨安民[2] 谌怡[2] 赵良超[2] 章林文[2] 刘克新[1] 

机构地区：[1]北京大学物理学院重离子物理研究所,北京100871 [2]中国工程物理研究院流体物理研究所,绵阳621900

出　　处：《真空科学与技术学报》2016年第9期981-986,共6页Chinese Journal of Vacuum Science and Technology

摘　　要：真空模拟软件大多是基于蒙特卡罗法开发,尚缺少成熟的商业软件。基于热辐射和真空分子流物理机理上的相似性,可以采用热辐射等效来模拟真空分子流。本文利用理想气体状态方程和分子运动论推导出了利用热辐射模拟进行真空管道传输几率计算的公式,利用ANSYS软件进行了二维和三维的热辐射模拟,利用公式计算得到的圆柱管和圆截面直角弯管传输几率和文献基本相符。此外针对二维模拟还分析了不同参数和网格尺寸对计算结果的影响。由于商业软件计算的便利性,热辐射等效方法可以高效地完成复杂模型的分析,为传输几率计算提供一种新的选择。Thetransmission probability of the molecular gas flow through vacuum pipewasmathematically modeled,theoretically analyzed in ideal-gas law and molecular kinetic theory,and numerically simulated with ANSYS by assuming that the molecular gas flow and heat radiation share equivalent mechanism. The 2-and 3-dimensional heat radiation simulations,in the cases of the gas flow in a cylindrical pipe and a circular right-angle elbow,were performed with ANSYS. The calculated transmission probabilities of heat radiation were found to agree fairly well with that of gas flow,previously reported in literature. In addition,the influence of the variables,including but not limited to the mesh size,mesh shape,NZONE and NDIV of ANSYS,on the simulation efficiency and precision was also investigated. We suggest that the equivalent heat radiation model may work well in simulation of transmission probability of the gas flow in a complicated situation.

关 键 词：分子流 流导 传输几率 热辐射模拟 

分 类 号：TB711[一般工业技术—真空技术]