Unifying suspension and granular shear-induced self-diffusion - Institut Universitaire des Systèmes Thermiques Industriels
Article Dans Une Revue Journal of Fluid Mechanics Année : 2024

Unifying suspension and granular shear-induced self-diffusion

Résumé

Shear-induced self-diffusion is a fundamental mode of transport in granular flows. Yet its critical behaviour and dependence on the particle solid fraction are still unclear. Here, we rationalize these dependencies by performing two-dimensional pressure-imposed numerical simulations of dense non-Brownian frictional suspensions. Our results, combined with existing numerical data on inertial granular flows, show that the shear-induced diffusion coefficients of both systems can be captured by a single function of the distance to jamming. They further show that the grain diffusive behaviour is underpinned by a specific random walk process, having a constant elementary step length driven at a frequency that increases with the solid fraction. The proposed scaling laws pave the way for a better understanding of mixing processes in granular media.
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Dates et versions

hal-04820084 , version 1 (05-12-2024)

Identifiants

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Shivakumar Athani, Bloen Metzger, Romain Mari, Yoël Forterre, Pierre Rognon. Unifying suspension and granular shear-induced self-diffusion. Journal of Fluid Mechanics, 2024, 998, pp.A55. ⟨10.1017/jfm.2024.695⟩. ⟨hal-04820084⟩
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