Rheology of dense granular flows for elongated particles

Dániel B. Nagy, Philippe Claudin, Tamás Börzsönyi, and Ellák Somfai
Phys. Rev. E 96, 062903 – Published 4 December 2017

Abstract

We study the rheology of dense granular flows for frictionless spherocylinders by means of 3D numerical simulations. As in the case of spherical particles, the effective friction μ is an increasing function of the inertial number I, and we systematically investigate the dependence of μ on the particle aspect ratio Q, as well as that of the normal stress differences, the volume fraction, and the coordination number. We show in particular that the quasistatic friction coefficient is nonmonotonic with Q: from the spherical case Q=1, it first sharply increases, reaches a maximum around Q1.05, and then gently decreases until Q=3, passing its initial value at Q2. We provide a microscopic interpretation for this unexpected behavior through the analysis of the distribution of dissipative contacts around the particles: as compared to spheres, slightly elongated grains enhance contacts in their central cylindrical band, whereas at larger aspect ratios particles tend to align and dissipate by preferential contacts at their hemispherical caps.

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  • Received 16 June 2017

DOI:https://doi.org/10.1103/PhysRevE.96.062903

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
  1. Physical Systems
Polymers & Soft Matter

Authors & Affiliations

Dániel B. Nagy1, Philippe Claudin2, Tamás Börzsönyi1, and Ellák Somfai1,*

  • 1Institute for Solid State Physics and Optics, Wigner Research Center for Physics, Hungarian Academy of Sciences, P.O. Box 49, H-1525 Budapest, Hungary
  • 2Physique et Mécanique des Milieux Hétérogènes, PMMH UMR 7636, ESPCI–CNRS–Université Paris-Diderot–Université Pierre-et-Marie-Curie, 10 rue Vauquelin, 75005 Paris, France

  • *somfai.ellak@wigner.mta.hu

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Issue

Vol. 96, Iss. 6 — December 2017

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