Molecular dynamics study of velocity slip in microchannels

  • Authors:

  • A. S. Ziarani;A. A. Mohamad

  • Affiliations:

  • Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta;Department of Mechanical and Manufacturing Engineering, University of Calgary, Calgary, Alberta

  • Venue:
  • MS'06 Proceedings of the 17th IASTED international conference on Modelling and simulation
  • Year:
  • 2006

Quantified Score

Hi-index 0.00

Visualization

Abstract

We report a nonequilibrium molecular dynamics simulation of a three dimensional micro-Poiseuille flow in Knudsen regime. A microchannel with atomically rough surface has been studied. The influence of gravity force, surface roughness, surface wetting condition and wall density was investigated. The surface roughness is constructed by atomic excrescences with random pattern. The results indicate that the no-slip condition can be observed for Knudsen flow when the surface is rough. The roughness showed to be a dominant parameter as far as the slip of fluid is concerned. The surface wetting condition influenced the velocity profiles substantially. The results indicate a non-monotonic variation of slip length with wall density.