Boundary Slip and Surface Interaction: A Lattice Boltzmann Simulation
CHEN Yan-Yan1,2,3, YI Hou-Hui4, LI Hua-Bing1,5
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, PO Box 800-204, Shanghai 2018002Graduate School of the Chinese Academy of Sciences, Beijing 1000803College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua 3210044Department of Physics and Electronic Science, Binzhou University, Shandong 2566005Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004
Boundary Slip and Surface Interaction: A Lattice Boltzmann Simulation
CHEN Yan-Yan1,2,3;YI Hou-Hui4;LI Hua-Bing1,5
1Shanghai Institute of Applied Physics, Chinese Academy of Sciences, PO Box 800-204, Shanghai 2018002Graduate School of the Chinese Academy of Sciences, Beijing 1000803College of Mathematics, Physics and Information Engineering, Zhejiang Normal University, Jinhua 3210044Department of Physics and Electronic Science, Binzhou University, Shandong 2566005Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004
摘要The factors affecting slip length in Couette geometry flows are analysed by means of a two-phase mesoscopic lattice Boltzmann model including non-ideal fluid-fluid and fluid-wall interactions. The main factors influencing the boundary slip are the strength of interactions between fluid-fluid and fluid-wall particles. Other factors, such as fluid viscosity, bulk pressure may also change the slip length. We find that boundary slip only occurs under a certain density (bulk pressure). If the density is large enough, the slip length will tend to zero. In our simulations, a low density layer near the wall does not need to be postulated a priori but emerges naturally from the underlying non-ideal mesoscopic dynamics. It is the low density layer that induces the boundary slip. The results may be helpful to understand recent experimental observations on the slippage of micro flows.
Abstract：The factors affecting slip length in Couette geometry flows are analysed by means of a two-phase mesoscopic lattice Boltzmann model including non-ideal fluid-fluid and fluid-wall interactions. The main factors influencing the boundary slip are the strength of interactions between fluid-fluid and fluid-wall particles. Other factors, such as fluid viscosity, bulk pressure may also change the slip length. We find that boundary slip only occurs under a certain density (bulk pressure). If the density is large enough, the slip length will tend to zero. In our simulations, a low density layer near the wall does not need to be postulated a priori but emerges naturally from the underlying non-ideal mesoscopic dynamics. It is the low density layer that induces the boundary slip. The results may be helpful to understand recent experimental observations on the slippage of micro flows.
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2008, Vol. 25 
