Yield stress and shear-banding in granular suspensions

Details Yield stress and shear-banding in granular suspensions Yield stress and shear-banding in granular suspensions

2009-07-13

arxiv.org/abs/0907.2106v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

We study the emergence of a yield stress in dense suspensions of non-Brownian particles, by combining local velocity and concentration measurements using Magnetic Resonance Imaging with macroscopic rheometric experiments. We show that the competition between gravity and viscous stresses is at the origin of the development of a yield stress in these systems at relatively low volume fractions. Moreover, it is accompanied by a shear banding phenomenon that is the signature of this competition. However, if the system is carefully density matched, no yield stress is encountered until a volume fraction of 62.7 0.3%.

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