Boundary lubrication: dynamics of squeeze-out.
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.
Zilberman
S
S
School of Chemistry, Tel Aviv University, Tel-Aviv 69978, Israel.
Persson
B N
BN
Nitzan
A
A
Mugele
F
F
Salmeron
M
M