Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-07-29
Phys. Rev. E 71 (2005), 051303
Physics
Condensed Matter
Statistical Mechanics
Submitted to Phys. Rev. E
Scientific paper
10.1103/PhysRevE.71.051303
In this work we present an experimental study of the jamming that stops the free flow of grains from a silo discharging by gravity. When the outlet size is not much bigger than the beads, granular material jams the outlet of the container due to the formation of an arch. Statistical data from the number of grains fallen between consecutive jams are presented. The information that they provide can help to understand the jamming phenomenon. As the ratio between the size of the orifice and the size of the beads is increased, the probability that an arch blocks the outlet decreases. We show here that there is a power law divergence of the mean avalanche size for a finite critical radius. Beyond this critical radius no jamming can occur and the flow is never stopped. The dependence of the arch formation on the shape and the material of the grains has been explored. It has been found that the material properties of the grains do not affect the arch formation probability. On the contrary, the shape of the grains deeply influences it. A simple model to interpret the results is also discussed.
Garcimartin Angel
Maza Diego
Pastor Juan M.
Pugnaloni Luis A.
Zuriguel Iker
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