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Silo flow and clogging in the presence of an obstacle
Phys. Rev. Fluids 7, 054301 – Published 26 May, 2022
DOI: https://doi.org/10.1103/PhysRevFluids.7.054301
Abstract
In this work we present experimental results of the flow and clogging of monodisperse spheres in a silo geometry, with an obstacle placed near the exit aperture. In previous work, it has been shown that the placement of an obstacle in a two-dimensional silo can suppress clogging. We extend prior work to investigate the effects of obstacle size, and find that larger obstacles are better at suppressing clogs; however, most obstacles will suppress clogging. We investigate the local velocity, granular temperature, and local packing for several specific cases, and find that the mechanisms of clog suppression may be different depending on the exact size of the obstacle, with one case not suppressing clogs at all. We find bulk granular temperatures are increased with the presence of an obstacle, but local temperatures near the exit may not be. We also find the average packing is not substantially affected by an obstacle, but the local packing can be quite different. Specifically, large obstacles introduce spatial disorder that percolates, resulting in a more fluid system overall. We also observe spatiotemporal inhomogeneity in the flows.
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