Rheology of a sonofluidized granular packing

Details Rheology of a sonofluidized granular packing Rheology of a sonofluidized granular packing

2009-07-02

arxiv.org/abs/0907.0317v3

Physics

Condensed Matter

Soft Condensed Matter

Accepted to be published in EPJE. v3: Includes changes suggested by referees

Scientific paper

We report experimental measurements on the rheology of a dry granular material under a weak level of vibration generated by sound injection. First, we measure the drag force exerted on a wire moving in the bulk. We show that when the driving vibration energy is increased, the effective rheology changes drastically: going from a non-linear dynamical friction behavior - weakly increasing with the velocity- up to a linear force-velocity regime. We present a simple heuristic model to account for the vanishing of the stress dynamical threshold at a finite vibration intensity and the onset of a linear force-velocity behavior. Second, we measure the drag force on spherical intruders when the dragging velocity, the vibration energy, and the diameters are varied. We evidence a so-called ''geometrical hardening'' effect for smaller size intruders and a logarithmic hardening effect for the velocity dependence. We show that this last effect is only weakly dependent on the vibration intensity.

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