Granular Rheology in Zero Gravity

Details Granular Rheology in Zero Gravity Granular Rheology in Zero Gravity

2003-09-05

arxiv.org/abs/cond-mat/0309146v4

Physics

Condensed Matter

Soft Condensed Matter

10 pages, 6 figures to be published in Journal of Physics : Condensed Matter

Scientific paper

We present an experimental investigation on the rheological behavior of model granular media made of nearly elastic spherical particles. The experiments are performed in a cylindrical Couette geometry and the experimental device is placed inside an airplane undergoing parabolic flights to cancel the effect of gravity. The corresponding curves, shear stress versus shear rate, are presented and a comparison with existing theories is proposed. The quadratic dependence on the shear rate is clearly shown and the behavior as a function of the solid volume fraction of particles exhibits a power law function. It is shown that theoretical predictions overestimate the experiments. We observe, at intermediate volume fractions, the formation of rings of particles regularly spaced along the height of the cell. The differences observed between experimental results and theoretical predictions are discussed and related to the structures formed in the granular medium submitted to the external shear.

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