超薄水膜剪切流的分子动力学模拟  

MOLECULAR DYNAMICS SIMULATION OF COUETTE FLOW FOR ULTRA-THIN WATER FILMS

作　　者：罗彬宾[1] 李祥[1] 陈云飞[1] 

机构地区：[1]东南大学机械工程学院,南京210096

出　　处：《机械工程学报》2007年第9期119-121,126,共4页Journal of Mechanical Engineering

基　　金：国家自然科学基金(50275026);江苏省自然科学基金(BK2002060)资助项目。

摘　　要：为揭示超薄膜的摩擦特性与微观结构的关系,运用分子动力学模拟的方法对其进行研究,采用固液比作为流体膜固化的定量描述,分别讨论温度、分子层数对固液比和摩擦力的影响。仿真结果表明,摩擦力随固液比的增大而增大;当壁面原子与液体膜原子的质量比增大时,会造成固液比缓慢上升,但摩擦力却随之下降,固液间滑移长度的增大是造成这一现象的主要原因。Molecular dynamics simulation is employed to investigate the relation between the properties of ultra-thin films and their microstructure. Solid-to-liquid ratio is introduced to estimate the solid-like of microstructure. In the process of simulation, the effects of the temperature and the film thickness on the solid-to-liquid ratio and the friction force are investigated. It is concluded that the friction force increases with the solid-to-liquid ratio. But the atomic mass of the solid wall has reverse effects on this phenomenon. It is postulated that the slip length increases with the increase of the atomic mass of the solid wall, which in turn reduces the friction force.

关 键 词：超薄膜 微观结构 分子动力学模拟 固液比 滑移长度 

分 类 号：TH117[机械工程—机械设计及理论]