Experiments in randomly agitated granular assemblies close to the jamming transition

Details Experiments in randomly agitated granular assemblies close to the jamming transition Experiments in randomly agitated granular assemblies close to the jamming transition

2004-03-24

arxiv.org/abs/cond-mat/0403604v1

Physics

Condensed Matter

Statistical Mechanics

Contribution to the volume "Unifying Concepts in Granular Media and Glasses", edt.s A. Coniglio, A. Fierro, H.J. Herrmann and

Scientific paper

10.1088/0953-8984/17/24/009

We present here the preliminary results obtained for two experiments on randomly agitated granular assemblies using a novel way of shaking. First we discuss the transport properties of a 2D model system undergoing classical shaking that show the importance of large scale dynamics for this type of agitation and offer a local view of the microscopic motions of a grain. We then develop a new way of vibrating the system allowing for random accelerations smaller than gravity. Using this method we study the evolution of the free surface as well as results from a light scattering method for a 3D model system. The final aim of these experiments is to investigate the ideas of effective temperature on the one hand as a function of inherent states and on the other hand using fluctuation dissipation relations.

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