Effect of hopper angle on granular clogging
Keywords: 
Área Física y Ciencias del Espacio
Issue Date: 
2019
ISSN: 
2470-0045
Citation: 
López-Rodríguez, D. (Diego); Gella, D.; To, K.; et al. "Effect of hopper angle on granular clogging". Physical review e. 99 (3), 2019, 1 - 6
Abstract
We present experimental results of the effect of the hopper angle on the clogging of grains discharged from a two-dimensional silo under gravity action. We observe that the probability of clogging can be reduced by three orders of magnitude by increasing the hopper angle. In addition, we find that for very large hopper angles, the avalanche size (s) grows with the outlet size (D) stepwise, in contrast to the case of a flat-bottom silo for which s grows smoothly with D. This surprising effect is originated from the static equilibrium requirement imposed by the hopper geometry to the arch that arrests the flow. The hopper angle sets the bounds of the possible angles of the vectors connecting consecutive beads in the arch. As a consequence, only a small and specific portion of the arches that jam a flat-bottom silo can survive in hoppers.

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