Importance of convection in the compaction mechanisms of anisotropic granular media

Abstract

We report the experimental observation of novel vortex patterns in a vertically tapped granular media. Depending on the tapping acceleration two behaviors are observed. For high acceleration a convection vortex appears in the whole media whereas for low acceleration two unstable vortices appear in the upper part of the media and slowly compact the lower part. We explain the formation of the vortices and relate them to granular convection. Our results demonstrate the importance of compression waves propagation on granular compaction.

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Cited by in corpus (10)

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• A neutron tomography study: probing the spontaneous crystallization of randomly packed granular assemblies
• Time Dependence and Density Inversion in Simulations of Vertically Oscillated Granular Layers
• Collective alignment controls rotation frustration in granular flows of elongated particles