Experimental and molecular dynamics study of gas flow characteristics in nanopores

作     者：LIU QiXin JIANG PeiXue XIANG Heng 

作者机构：Key Laboratory for Thermal Science and Power Engineering of Ministry of EducationBeijing Key Laboratory of CO_(2)Utilization and Reduction TechnologyDepartment of Thermal EngineeringTsinghua UniversityBeijing 100084China 

出 版 物：《Chinese Science Bulletin》 (Chin. Sci. Bull.)

年 卷 期：2012年第57卷第13期

页      面：1488-1493页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：supported by the THPCC supported by the National Natural Science Foundation of China (50676047 and 50736003) 

主　　题：气体流动特性 分子动力学 特性实验 纳米孔 Knudsen数 气体粘度 数值模拟 摩擦系数 

摘      要：Gas flow characteristics in nanopores were investigated experimentally and numerically using molecular dynamics (MD) simulations with an emphasis on the friction factor and gas viscosity. The results show that the viscosity and the friction factor in nanopores are much lower than those in macroscale channels. The actual viscosities obtained from the MD studies showed that the gas viscosity in nanopores is less than the macroscale viscosity because collisions between gas molecules are less frequent in high Knudsen number flows and there are more collisions with the wall. The MD simulations show that the velocity profile is composed of two parts, with a much steeper velocity gradient near the wall.