Flow and rheology of frictional elongated grains

Abstract

The rheology of a 3-dimensional granular system consisting of frictional elongated particles was investigated by means of discrete element model (DEM) calculations. A homogenous shear flow of frictional spherocyliders was simulated, and a number of rheological quantities were calculated. In the framework of the $\mu (I)$ rheology, the effective friction was found to be a non-monotonic function of the aspect ratio for interparticle friction coefficient ${\mu }_p\lesssim 0.4$, while it was an increasing function for larger ${\mu }_p$. We reveal the microscopic origin of this peculiar non-monotonic behavior. We show the non-trivial dependence of the velocity fluctuations on the dissipation regime, and trace back the behavior of the normal stress differences to particle-level quantities.

13 pages + 3 pages supplementary material

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• Transverse vortices induced by modulated granular shear flows of elongated particles
• Shear flow of frictional spheroids: Comparison between elongated and flattened particles
• Collective alignment controls rotation frustration in granular flows of elongated particles