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Wortel G, Börzsönyi T, Somfai E, et al. Heaping, secondary flows and broken symmetry in flows of elongated granular particles. Soft Matter. 2015;11(13):2570-6doi: 10.1039/c4sm02534b.
Wortel, G., Börzsönyi, T., Somfai, E., Wegner, S., Szabó, B., Stannarius, R., & van Hecke, M. (2015). Heaping, secondary flows and broken symmetry in flows of elongated granular particles. Soft matter, 11(13), 2570-6. https://doi.org/10.1039/c4sm02534b
Wortel, Geert, et al. "Heaping, secondary flows and broken symmetry in flows of elongated granular particles." Soft matter vol. 11,13 (2015): 2570-6. doi: https://doi.org/10.1039/c4sm02534b
Wortel G, Börzsönyi T, Somfai E, Wegner S, Szabó B, Stannarius R, van Hecke M. Heaping, secondary flows and broken symmetry in flows of elongated granular particles. Soft Matter. 2015 Apr 07;11(13):2570-6. doi: 10.1039/c4sm02534b. PMID: 25679351.
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Soft Matter. 2015 Apr 07;11(13):2570-6. doi: 10.1039/c4sm02534b.

Heaping, secondary flows and broken symmetry in flows of elongated granular particles.

Soft matter

Geert Wortel, Tamás Börzsönyi, Ellák Somfai, Sandra Wegner, Balázs Szabó, Ralf Stannarius, Martin van Hecke

Affiliations

  1. Huygens-Kamerlingh Onnes Lab, Postbus 9504, 2300 RA Leiden, The Netherlands. [email protected].

PMID: 25679351 DOI: 10.1039/c4sm02534b

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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