Slip, concentration fluctuations and flow instability in sheared polymer solutions

Details Slip, concentration fluctuations and flow instability in sheared polymer solutions Slip, concentration fluctuations and flow instability in sheared polymer solutions

2001-01-23

arxiv.org/abs/cond-mat/0101356v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1021/ma0107455

Recent experiments suggest that shear-enhanced growth of concentration fluctuations in polymer solutions is strongly influenced by solid boundaries. We analyze the dynamics of a model of a sheared polymer solution, accounting for the effect of stress variations on mass flux and for wall-slip. If (and only if) these effects are present, the flow exhibits a boundary-localized instability consistent with experimental observations. Even in the absence of flow instability, thermally-driven concentration fluctuations are significantly enhanced near the boundary.

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