Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions

Details Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions Shear zones and wall slip in the capillary flow of concentrated colloidal suspensions

2007-02-27

arxiv.org/abs/cond-mat/0702651v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

10.1103/PhysRevLett.98.198305

We image the flow of a nearly random close packed, hard-sphere colloidal suspension (a `paste') in a square capillary using confocal microscopy. The flow consists of a `plug' in the center while shear occurs localized adjacent to the channel walls, reminiscent of yield-stress fluid behavior. However, the observed scaling of the velocity profiles with the flow rate strongly contrasts yield-stress fluid predictions. Instead, the velocity profiles can be captured by a theory of stress fluctuations originally developed for chute flow of dry granular media. We verified this behavior both for smooth and rough boundary conditions.

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