中文摘要：

本文采用分子动力学方法模拟液体在定截面及变截面纳米通道内的三维Poiseuille流动,研究液体浸润性及通道截面变化对纳米通道内液体流动的影响。研究结果表明:液体对壁面不湿润时,壁面处有速度滑移存在,并且随接触角的增大而增大,液体对壁面湿润则不存在速度滑移;同时,摩擦阻力系数随接触角的减小而增大。通道截面形状的变化对流场的影响随着远离变截面位置而迅速减弱,对流体通道平直处的流体速度相对值分布影响不大,对摩擦阻力系数影响较大。

英文摘要：

The molecular dynamics method was used to simulate three-dimensional fluid Poiseuille flow in constant and variable cross-sectional nanochannels and to investigate the effects of surface wettability and cross-sectional variations on the fluid flow in the nanochannels.The simulations show that velocity slip occurs when fluids flow on hydrophobic surfaces with the amount of the velocity slip increasing with increasing contact angle.However,there is no velocity slip on hydrophilic surfaces. For all conditions,...