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Experiments in randomly agitated granular assemblies close to the jamming transition

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arxiv cond-mat/0403604 v1 pith:TKL3TYDS submitted 2004-03-24 cond-mat.stat-mech cond-mat.dis-nn

Experiments in randomly agitated granular assemblies close to the jamming transition

G. Caballero , A. Lindner , G. Ovarlez , G. Reydellet , J. Lanuza , E. Clement This is my paper
classification cond-mat.stat-mech cond-mat.dis-nn
keywords experimentssystemagitatedassembliesgranularhandmethodmodel
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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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