Regensburg 2010 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 31: Poster: Polymer Dynamics

CPP 31.1: Poster

Wednesday, March 24, 2010, 17:30–19:00, Poster C

Semidilute Polymer Solutions under Shear Flow — •Chien-Cheng Huang, Roland G. Winkler, and Gerhard Gompper — Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich

In shear flow, polymers exhibit remarkably large conformational fluctuations due to tumbling motion, i.e., a polymer stretches and recoils in the coarse of time. In the average, a polymer is aligned, which implies shear thinning at sufficiently large shear rates. To characterize the conformational, dynamical, and rheological properties of semidilute polymers solutions under shear flow, we performed novel mesoscale hydrodynamic simulations combining molecular dynamics simulations and the multiparticle collision dynamics (MPC) approach. At equilibrium, the dependence of the radius of gyration and the zero-shear viscosity on the polymer concentration is in agreement with scaling predictions. The alignment, shear viscosity, and tumbling time are determined for various concentrations and shear rates. In the dilute limit, these quantities are functions of the Weissenberg number only and are in agreement with available analytical theories. Above the overlap concentration, additional density effects are obtained, which cannot be accounted for by the Weissenberg number.