Clustering-Induced Attraction in Granular Mixtures of Rods and Spheres

Gustavo M Rodríguez-Liñán, Yuri Nahmad-Molinari and Gabriel Pérez-Ángel

PLOS ONE, 2016, vol. 11, issue 5, 1-11

Abstract: Depletion-induced aggregation of rods enhanced by clustering is observed to produce a novel model of attractive pairs of rods separated by a line of spheres in a quasi-2D, vertically-shaken, granular gas of rods and spheres. We show that the stability of these peculiar granular aggregates increases as a function of shaking intensity. Velocity distributions of spheres inside and outside of a pair of rods trapping a line of spheres show a clear suppression of the momentum acquired by the trapped spheres. The condensed phase formed between the rods is caused by a clustering instability of the trapped spheres, enhanced by a vertical guidance produced by the confining rods. The liberated area corresponding to direct excluded-volume pairs and indirect depletion-aggregated pairs is measured as a function of time. The stability of rod pairs mediated by spheres reveals an attraction comparable in strength to the one purely induced by depletion forces.

Date: 2016
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Persistent link: https://EconPapers.repec.org/RePEc:plo:pone00:0156153

DOI: 10.1371/journal.pone.0156153

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