Slip boundary conditions for shear flow of polymer melts past atomically flat surfaces

@article{citeulike:2874100, abstract = {Molecular dynamics simulations are carried out to investigate the dynamic behavior of the slip length in thin polymer films confined between atomically smooth thermal surfaces. For weak wall-fluid interactions, the shear rate dependence of the slip length acquires a distinct local minimum followed by a rapid growth at higher shear rates. With increasing fluid density, the position of the local minimum is shifted to lower shear rates. We found that the ratio of the shear viscosity to the slip length, which defines the friction coefficient at the liquid/solid interface, undergoes a transition from a nearly constant value to power law decay as a function of the slip velocity. In a wide range of shear rates and fluid densities, the friction coefficient is determined by the product of the value of the surface-induced peak in the structure factor and the contact density of the first fluid layer near the solid wall.}, author = {Niavarani, Anoosheh and Priezjev, Nikolai V. }, citeulike-article-id = {2874100}, doi = {http://dx.doi.org/10.1103/PhysRevE.77.041606}, journal = {Physical Review E (Statistical, Nonlinear, and Soft Matter Physics)}, keywords = {2008, boundary, flow, interaction, polymer, shear, slip, surface}, number = {4}, posted-at = {2008-06-08 22:50:24}, priority = {2}, publisher = {APS}, title = {Slip boundary conditions for shear flow of polymer melts past atomically flat surfaces}, url = {http://dx.doi.org/10.1103/PhysRevE.77.041606}, volume = {77}, year = {2008} }

TY - JOUR ID - citeulike:2874100 L3 - citeulike-article-id:2874100 TI - Slip boundary conditions for shear flow of polymer melts past atomically flat surfaces JF - Physical Review E (Statistical, Nonlinear, and Soft Matter Physics) VL - 77 IS - 4 PB - APS N2 - Molecular dynamics simulations are carried out to investigate the dynamic behavior of the slip length in thin polymer films confined between atomically smooth thermal surfaces. For weak wall-fluid interactions, the shear rate dependence of the slip length acquires a distinct local minimum followed by a rapid growth at higher shear rates. With increasing fluid density, the position of the local minimum is shifted to lower shear rates. We found that the ratio of the shear viscosity to the slip length, which defines the friction coefficient at the liquid/solid interface, undergoes a transition from a nearly constant value to power law decay as a function of the slip velocity. In a wide range of shear rates and fluid densities, the friction coefficient is determined by the product of the value of the surface-induced peak in the structure factor and the contact density of the first fluid layer near the solid wall. KW - 2008 KW - boundary KW - flow KW - interaction KW - polymer KW - shear KW - slip KW - surface AU - Niavarani, Anoosheh AU - Priezjev, Nikolai PY - 2008/// UR - http://dx.doi.org/10.1103/PhysRevE.77.041606 ER -