Granular compaction and stretched exponentials - Experiments and a numerical stochastic model

Publisher： Edp Sciences

E-ISSN： 2100-014x|140|issue|08001-08001

ISSN： 2100-014x

Source： EPJ Web of Conference, Vol.140, Iss.issue, 2017-06, pp. : 08001-08001

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Abstract

We present a stochastic model to investigate the compaction kinetics of a granular material submitted to vibration. The model is compared to experimental results obtained with glass beads and with a cohesive powder. We also propose a physical interpretation of the characteristic time τ and the exponent β of the stretched exponential function widely used to represent the granular compaction kinetics, and we show that the characteristic time is proportional to the number of grains to move. The exponent β is expressed as a logarithmic compaction rate.

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