Migration of semiflexible polymers in microcapillary flow

Details Migration of semiflexible polymers in microcapillary flow Migration of semiflexible polymers in microcapillary flow

2010-06-23

arxiv.org/abs/1006.4485v1

EPL 91 (2010) 14001

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 7 figures, accepted by EPL

Scientific paper

10.1209/0295-5075/91/14001

The non-equilibrium structural and dynamical properties of a semiflexible polymer confined in a cylindrical microchannel and exposed to a Poiseuille flow is studied by mesoscale hydrodynamic simulations. For a polymer with a length half of its persistence length, large variations in orientation and conformations are found as a function of radial distance and flow strength. In particular, the polymer exhibits U-shaped conformations near the channel center. Hydrodynamic interactions lead to strong cross-streamline migration. Outward migration is governed by the polymer orientation and the corresponding anisotropy in its diffusivity. Strong tumbling motion is observed, with a tumbling time which exhibits the same dependence on Peclet number as a polymer in shear flow.

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