Dense granular flow around a penetrating object: Experiments and hydrodynamic model

Details Dense granular flow around a penetrating object: Experiments and hydrodynamic model Dense granular flow around a penetrating object: Experiments and hydrodynamic model

2011-06-24

arxiv.org/abs/1106.4919v1

Phys. Rev. Lett. 107 (2011), 048001

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.107.048001

We present in this Letter experimental results on the bidimensional flow field around a cylinder penetrating into dense granular matter together with drag force measurements. A hydrodynamic model based on extended kinetic theory for dense granular flow reproduces well the flow localization close to the cylinder and the corresponding scalings of the drag force, which is found to not depend on velocity, but linearly on the pressure and on the cylinder diameter and weakly on the grain size. Such a regime is found to be valid at a low enough "granular" Reynolds number.

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