Gravity Governs Shear Localization in Confined Dense Granular Flows

Shaebani, M. Reza; Török, János; Maleki, Maniya; Madani, Mahnoush; Harrington, Matt; Rice, Allyson M.; Losert, Wolfgang

doi:10.1103/physrevlett.127.278003

Cited by 4 publications

(1 citation statement)

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“…Granular materials had fundamental importance in human civilization since millennia, but still, their dynamical and structural behavior is much less understood than that of ordinary solids, liquids or gases, and it is often quite counter-intuitive. Ensembles of hard spherical grains have been studied extensively, and important progress was, and still is, achieved regarding, e. g., packing [1][2][3], shear characteristics and flow [4][5][6], jamming [7,8], and internal stress distributions [9][10][11]. Recent research has been increasingly dedicated to shapeanisotropic (e. g. [12][13][14]) and soft grains [15][16][17][18][19].…”

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confidence: 99%

Reversed granular Weissenberg effect in ensembles of sheared non-convex granular particles

Mohammadi¹,

Puzyrev²,

Trittel³

et al. 2022

Preprint

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Studies of granular materials, both theoretical and experimental, are often restricted to convex grain shapes. We demonstrate that a non-convex grain shape can lead to a qualitatively novel macroscopic dynamics. Spatial crosses (hexapods) are continuously sheared in a split-bottom container. Thereby, they develop a secondary flow profile that is completely opposite to that of rod-shaped or lentil-shaped convex grains in the same geometry. The crosses at the surface migrate towards the rotation center and sink there, mimicking an 'inverse Weissenberg effect'. The observed surface flow field suggests the existence of a radial outward flow in the depth of the granular bed, thus forming a convection cell. This flow field is connected with a dimple formed in the rotation center. The effect is strongly dependent on the particle geometry and the height of the granular bed.

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