Prediction of Gas Flow Through Rough Microchannels Using a Lattice Boltzmann Method

摘要

In this paper, a lattice Boltzmann method is used to study gas flow through rough microchannels. The main objective is to investigate the effects of surface roughness on characteristics of gas flow through two-dimensional microchannels. Randomized rough boundary condition is used to simulate the gas-surface interaction directly for rough walls. By using this method there is no need to utilize any additional correction factor to model the fluid flow near the rough surface. Gas flow through two microchannels were computed and compared with the experimental and numerical data. As expected rough surface decreases the mass flow and slip velocity compare to the smooth surface. However, for rough channels, increase in surface roughness height decreases the mass flow but increases the slip velocity.