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Compaction dynamics of a granular medium under vertical tapping Export

by: P. Philippe, D. Bideau
EPL (Europhysics Letters), Vol. 60, No. 5. (2002), pp. 677-683.

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We report new experimental results on granular compaction under consecutive vertical taps. The evolution of the mean volume fraction and of the mean potential energy of a granular packing presents a slow densification until a final steady state, and is reminiscent of usual relaxation in glasses via a stretched exponential law. The intensity of the taps seems to rule the characteristic time of the relaxation according to an Arrhenius's type relation. Finally, the analysis of the vertical volume fraction profile reveals an almost homogeneous densification in the packing.


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