Simulation studies for dilute polymeric systems are presented using the dissipative particle dynamics method. By employing two different thermostats, the velocity-Verlet and Lowe’s scheme, we show that the Schmidt number of the solvent strongly affects nonequilibrium polymeric quantities. The fractional extension of wormlike chains subjected to steady shear is obtained as a function of . Poiseuille flow in microchannels for fixed polymer concentration and varying number of repeated units within a chain is simulated. The nonuniform concentration profiles and their dependence on are computed. We show the effect of the bounce-forward wall boundary condition on the depletion layer thickness. A power law fit of the velocity profile in stratified Poiseuille flow in a microchannel yields wall viscosities different from bulk values derived from uniform, steady plane Couette flow. The form of the velocity profiles indicates that the slip flow model is not useful for the conditions of these calculations.
Skip Nav Destination
Research Article| November 09 2006
Schmidt number effects in dissipative particle dynamics simulation of polymers
George Em Karniadakis;
Vasileios Symeonidis, George Em Karniadakis, Bruce Caswell; Schmidt number effects in dissipative particle dynamics simulation of polymers. J. Chem. Phys. 14 November 2006; 125 (18): 184902. https://doi.org/10.1063/1.2360274
Download citation file: