Orientational order and alignment of elongated particles induced by shear

Details Orientational order and alignment of elongated particles induced by shear Orientational order and alignment of elongated particles induced by shear

2012-04-26

arxiv.org/abs/1204.5972v1

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures, accepted to Phys. Rev. Lett

Scientific paper

Shear induced alignment of elongated particles is studied experimentally and numerically. We show that shear alignment of ensembles of macroscopic particles is comparable even on a quantitative level to simple molecular systems, despite the completely different types of particle interactions. We demonstrate that for dry elongated grains the preferred orientation forms a small angle with the streamlines, independent of shear rate across three decades. For a given particle shape, this angle decreases with increasing aspect ratio of the particles. The shear-induced alignment results in a considerable reduction of the effective friction of the granular material.

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