AI Article Synopsis
- The study investigates the shearing of granular rods in split-bottom setups, revealing that a notable heap can form at the surface, reaching at least 40% of the filling height.
- The heaping phenomenon is attributed to a significant secondary flow that does not occur with spherical particles, and flow reversal affects this secondary flow, causing quick collapses and slower heap regenerations.
- The research posits that a misalignment between the average orientation of the particles and the flow streamlines drives the secondary flow, implying this mechanism is relevant for flows involving other anisometric grains.
Article Abstract
In this paper we report experiments where we shear granular rods in split-bottom geometries, and find that a significant heap of height of least 40% of the filling height can form at the particle surface. We show that heaping is caused by a significant secondary flow, absent for spherical particles. Flow reversal transiently reverses the secondary flow, leading to a quick collapse and slower regeneration of the heap. We present a symmetry argument and experimental data that show that the generation of the secondary flow is driven by a misalignment of the mean particle orientation with the streamlines of the flow. This general mechanism is expected to be important in all flows of sufficiently anisometric grains.
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| http://dx.doi.org/10.1039/c4sm02534b | DOI Listing |
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