Boundary lubrication: dynamics of squeeze-out.

Research paper by S S Zilberman, B N BN Persson, A A Nitzan, F F Mugele, M M Salmeron

Indexed on: 21 Jun '01Published on: 21 Jun '01Published in: Physical review. E, Statistical, nonlinear, and soft matter physics


The dynamics of the expulsion of the last liquid monolayer of molecules confined between two surfaces (measured recently for the first time) has been analyzed by solving the two-dimensional Navier-Stokes equation combined with kinetic Monte Carlo simulations. Instabilities in the boundary line of the expelled film were observed. We show that the instabilities produce a rough boundary for all length scales above a critical value and a smooth boundary for shorter lengths. The squeezing out of all but a few trapped islands of liquid is shown to be the result of the pressure gradient in the contact area.