Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2005-03-07
Physics
Condensed Matter
Other Condensed Matter
to appear in the european physical journal E (EPJE)
Scientific paper
10.1140/epje/i2004-10096-x
We report on experiments to measure the temporal and spatial evolution of packing arrangements of anisotropic and weakly confined granular material, using high-resolution $\gamma$-ray adsorption. In these experiments, the particle configurations start from an initially disordered, low-packing-fraction state and under vertical solicitations evolve to a dense state. We find that the packing fraction evolution is slowed by the grain anisotropy but, as for spherically shaped grains, can be well fitted by a stretched exponential. For a given type of grains, the characteristic times of relaxation and of convection are found to be of the same order of magnitude. On the contrary compaction mechanisms in the media strongly depend on the grain anisotropy.
Bideau Daniel
Delannay Renaud
Ribière Philippe
Richard Patrick
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