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Issue 13, 2015
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Heaping, secondary flows and broken symmetry in flows of elongated granular particles

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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.

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

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Publication details

The article was received on 14 Nov 2014, accepted on 09 Feb 2015 and first published on 09 Feb 2015


Article type: Paper
DOI: 10.1039/C4SM02534B
Citation: Soft Matter, 2015,11, 2570-2576
  • Open access: Creative Commons BY-NC license
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    Heaping, secondary flows and broken symmetry in flows of elongated granular particles

    G. Wortel, T. Börzsönyi, E. Somfai, S. Wegner, B. Szabó, R. Stannarius and M. van Hecke, Soft Matter, 2015, 11, 2570
    DOI: 10.1039/C4SM02534B

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