The slip phenomena in thin polymer films confined by either flat or periodically corrugated surfaces are investigated by molecular dynamics and continuum simulations. For atomically flat surfaces and weak wall-fluid interactions, the shear rate dependence of the slip length has a distinct local minimum which is followed by a rapid increase at higher shear rates. For corrugated surfaces with wavelength larger than the radius of gyration of polymer chains, the effective slip length decays monotonically with increasing corrugation amplitude. At small amplitudes, this decay is reproduced accurately by the numerical solution of the Stokes equation with constant and rate-dependent local slip length. When the corrugation wavelength is comparable to the radius of gyration, the continuum predictions overestimate the effective slip length obtained from molecular dynamics simulations. The analysis of the conformational properties indicates that polymer chains tend to stretch in the direction of shear flow above the crests of the wavy surface.

10aliquid films10amolecular dynamics method10apolymer melts10arheology10ashear flow10aslip flow10asurface roughness1 aNiavarani, A.1 aPriezjev, N., V uhttps://icer.msu.edu/research/publications/rheological-study-polymer-flow-past-rough-surfaces-slip-boundary-conditions01199nas a2200133 4500008004100000245006200041210006100103260001200164300001000176490000700186520077300193100002000966856007900986 2007 eng d00aRate-dependent slip boundary conditions for simple fluids0 aRatedependent slip boundary conditions for simple fluids c05/2007 a516050 v753 aThe dynamic behavior of the slip length in a fluid flow confined between atomically smooth surfaces is investigated using molecular dynamics simulations. At weak wall-fluid interactions, the slip length increases nonlinearly with the shear rate provided that the liquid/solid interface forms incommensurable structures. A gradual transition to the linear rate dependence is observed upon increasing the wall-fluid interaction. We found that the slip length can be well described by a function of a single variable that in turn depends on the in-plane structure factor, contact density, and temperature of the first fluid layer near the solid wall. Extensive simulations show that this formula is valid in a wide range of shear rates and wall-fluid interactions.

1 aPriezjev, N., V uhttps://icer.msu.edu/rate-dependent-slip-boundary-conditions-simple-fluids