中国计量大学学报2017，Vol.28Issue(3)：293-299,7.DOI:10.3969/j.issn.2096-2835.2017.03.005
纳米尺度Poiseuille流动中气体黏度的分子动力学研究
Molecular dynamics simulation of gas viscosity in nano-scale Poiseuille flow
摘要
Abstract
Due to the effect of wall and rarefaction ,gas flow characteristics in nano-scale channels are different from those in macro-scale flow .Gas Poiseuille flows in nano-scale channels were investigated by using the molecular dynamics simulation . The equivalent local viscosity was defined based on the Newton law of viscosity .According to simulation results ,the gaseous flow in a nano-scale channel can be divided into two regions ,the bulk region and the near-wall region .The equivalent viscosity in the bulk region agrees well with macro value .However ,the equivalent viscosity decreases rapidly in the near-wall region .The gas equivalent viscosities always agrees well with macro values at different gas densities , temperatures and gas-wall interactions .In nano-scale channel flows ,the wall-influence-depth increases with the decrease of gas density because of the rarefaction effect .The wall-influence-depth is at the order of 10 nm .This depth doesn't vary with gas temperature and fluid-wall interaction .关键词
纳米通道/等效黏度/分子动力学/Poiseuille流Key words
nano-scale channel flow/equivalent viscosity/molecular dynamics/Poiseuille flow分类
数理科学引用本文复制引用
陈洁敏,包福兵,凃程旭,尹招琴..纳米尺度Poiseuille流动中气体黏度的分子动力学研究[J].中国计量大学学报,2017,28(3):293-299,7.基金项目
国家自然科学基金资助项目(No.11372298,11672284),国家重点研发技术重点专项项目(No.2017YFB0603701). （No.11372298,11672284）
