Tumbling of polymers in semidilute solution under shear flow
Institute of Complex Systems, Forschungszentrum Jülich - D-52425 Jülich, Germany, EU
2 Jülich Supercomputing Centre, Forschungszentrum Jülich - D-52425 Jülich, Germany, EU
3 Institute for Advanced Simulation, Forschungszentrum Jülich - D-52425 Jülich, Germany, EU
Accepted: 11 February 2011
The tumbling dynamics of individual polymers in semidilute solution is studied by large-scale non-equilibrium mesoscale hydrodynamic simulations. We find that the tumbling time is equal to the non-equilibrium relaxation time of the polymer end-to-end distance along the flow direction and strongly depends on concentration. In addition, the normalized tumbling frequency as well as the widths of the alignment distribution functions for a given concentration-dependent Weissenberg number exhibit a weak concentration dependence in the cross-over regime from a dilute to a semidilute solution. For semidilute solutions a universal behavior is obtained. This is a consequence of screening of hydrodynamic interactions at polymer concentrations exceeding the overlap concentration.
PACS: 47.57.Ng – Polymers and polymer solutions / 83.10.Rs – Computer simulation of molecular and particle dynamics / 47.11.St – Multi-scale methods
© EPLA, 2011