Slip, concentration fluctuations and flow instability in sheared polymer solutions
Soft Condensed Matter
2009-11-07 v1 Statistical Mechanics
Fluid Dynamics
Abstract
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.
Cite
@article{arxiv.cond-mat/0101356,
title = {Slip, concentration fluctuations and flow instability in sheared polymer solutions},
author = {William B. Black and Michael D. Graham},
journal= {arXiv preprint arXiv:cond-mat/0101356},
year = {2009}
}