Tumbling of polymers in semidilute solution under shear flow

Details Tumbling of polymers in semidilute solution under shear flow Tumbling of polymers in semidilute solution under shear flow

2011-03-18

arxiv.org/abs/1103.3567v1

EPL, 93, 54004 (2011)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1209/0295-5075/93/54004

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.

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