Characteristics of Liquid Flows Affected by the Surface Wettability of Solid in Nano-Scales
- 作者：Song Fuquan
- 会议时间：2011-04-28
- 关键词：molecular dynamics simulation ; Poiseuille flow ; wettability ; velocity slippage ; nano-flow
- 作者单位：Department of Physics,Zhejiang Normal University,Jinhua Zhejiang 321004,China
- 母体文献：第十一届全国渗流力学学术大会论文集
- 会议名称：第十一届全国渗流力学学术大会
- 会议地点：重庆
- 主办单位：中国力学学会
- 语种：chi
摘要
Influences of the wettability on a liquid flow between two parallel plane walls were studied by using Non-Equilibrium Molecular Dynamics (NEMD) simulation.The wettability of the solid surfaces can be described as the contact angle.The liquid flow rate, the slip velocity and the slip length which effected by the contact angle were investigated.The results show the boundary condition at a microscopic level is different from a "no-slip" condition at a macroscopic level.There exits a slippage of a liquid flow for the hydrophobic boundary and it need an external force to overcome threshold pressure for the hydrophilic boundary.And the orderly layered distributions of the liquid particles near the hydrophilic surface vary from ones near the hydrophobic surface.The study finds that the surface wettability plays a significant role on possibilities of forming a viscous layer and the direct slip at the solid surface.The resistance of liquid flow can be decreased by changing the wettability of boundary surface.