Liquid flow in pores: Slip, no-slip, or multilayer sticking

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Abstract
The Hagen-Poiseuille flow of a Lennard-Jones liquid through a cylindrical pore formed by regularly arranged fixed atoms is studied by molecular-dynamics (MD) simulations. Different flow patterns develop depending on the strength of the wall-fluid interaction, the strength of the gravitational-type driving force, the thermodynamic state, and also on the mechanism of heat dissipation. In spite of the high driving forces necessary in MD it is found that up to two molecular layers may stick at the wall which confirms recent experimental findings.