Flow of magnetic repelling grains in a two-dimensional silo

Abstract

During a typical silo discharge, the material flow rate is determined by the contact forces between the grains. Here, we report an original study concerning the discharge of a two-dimensional silo filled with repelling magnetic grains. This non-contact interaction leads to a different dynamics from the one observed with conventional granular materials. We found that, although the flow rate dependence on the aperture size follows roughly the power-law with an exponent $3/2$ found in non-repulsive systems, the density and velocity profiles during the discharge are totally different. New phenomena must be taken into account. Despite the absence of contacts, clogging and intermittence were also observed for apertures smaller than a critical size determined by the effective radius of the repulsive grains.

6 pages, 8 figures

References in corpus (2)

• Breaking arches with vibrations: the role of defects
• Invited review: Clogging of granular materials in bottlenecks

Cited by in corpus (8)

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• Details of soft particle clogging in two-dimensional hoppers
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• A counterintuitive way to speed up pedestrian and granular bottleneck flows prone to clogging: Can 'more' escape faster?
• The simultaneous discharge of liquid and grains from a silo
• Increasing granular flow rate with obstructions
• Surface depression with double-angle geometry during the discharge of close-packed grains from a silo
• Disordering two-dimensional magnet-particle configurations using bidispersity