Kinetic study of the Rayleigh-Bénard flows  

作　　者：ZHANG Jun FAN Jing 

机构地区：[1]Laboratory of High Temperature Gas Dynamics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China

出　　处：《Chinese Science Bulletin》2009年第3期364-368,共5页

基　　金：Supported by the National Natural Science Foundation of China (Grant Nos. 90205024, 10502051 and 10621202)

摘　　要：The present paper employs the direct simulation Monte Carlo (DSMC) method to study the Rayleigh-Bénard flows, where the temperature ratio of the upper to lower plate is fixed to 0.1. For a Knudsen number (Kn) of 0.01, as the Rayleigh number (Ra) increases, the flow changes from the thermal conductive state to the convective state at about Ra=1700, and the calculated relation of heat flux through the lower plate versus Ra is in good agreement with classical experimental and theoretical results. For Kn=0.05, the thermal conductive state remains stable, and the increase of Ra cannot trigger thermal instability.The present paper employs the direct simulation Monte Carlo （DSMC） method to study the Rayleigh-Bénard flows, where the temperature ratio of the upper to lower plate is fixed to 0.1. For a Knudsen number （Kn） of 0.01, as the Rayleigh number （Ra） increases, the flow changes from the thermal conductive state to the convective state at about Ra=-1700, and the calculated relation of heat flux through the lower plate versus Ra is in good agreement with classical experimental and theoretical results. For Kn=0.05, the thermal conductive state remains stable, and the increase of Ra cannot trigger thermal instability.

关 键 词：Rayleigh-Bénard流 热对流 动力学研究 蒙特卡洛法 

分 类 号：O3[理学—力学]