【作者】 王利民； 葛蔚； 陈飞国；

【Author】 WANG Li-min, GE Wei, CHEN Fei-guo (Multi-phase Reaction Laboratory, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China; Graduate University of Chinese Academy of Sciences, Beijing 100049, China)

【机构】 中国科学院过程工程研究所多相反应实验室；

【摘要】 采用微观的拟颗粒模拟研究了努森数在0．01-0．2范围内气体微槽道流动的速度和温度分布．发现速度分布主要受努森数和所加外场力的影响,随努森数增加,壁面滑移速度先增后降,而温度分布也受外力场的显著影响．达西摩擦因子随努森数增大而增大,而它随马赫数的变化类似实验观察到的所谓层流向湍流转捩提前的趋势．更多还原

【Abstract】 The velocity profiles and temperature distributions of gas flows in micro-channels, for Knudsen numbers ranging from 0.01 to 0.2, are investigated with Pseudo-Particle Modeling (PPM). It has been found that the velocity profiles are mainly affected by Knudsen number and the external force fields applied. When Knudsen number was increased, the slip velocities on the walls increased at the beginning, and then decreased. The temperature distributions were also significantly affected by the external force. The Darcy friction factor increased with increasing Knudsen number, and its variation with Mach number under increased Knudsen number was similar to the so-called premature laminar-turbulent transition observed in experiments.更多还原