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

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

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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.

Original languageEnglish
Pages (from-to)2570-2576
Number of pages7
JournalSoft Matter
Volume11
Issue number13
DOIs
Publication statusPublished - Apr 7 2015

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ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics

Cite this

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), 2570-2576. https://doi.org/10.1039/c4sm02534b