Rheology of dense granular flows for elongated particles

Dániel B. Nagy, Philippe Claudin, T. Börzsönyi, Ellák Somfai

Research output: Contribution to journalArticle

7 Citations (Scopus)

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 Q≃1.05, and then gently decreases until Q=3, passing its initial value at Q≃2. 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.

Original languageEnglish
Article number062903
JournalPhysical Review E
Volume96
Issue number6
DOIs
Publication statusPublished - Dec 4 2017

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Granular Flow
Rheology
rheology
Contact
Aspect Ratio
aspect ratio
Dissipate
Increasing Functions
Friction Coefficient
coordination number
Volume Fraction
caps
coefficient of friction
Friction
friction
Tend
Numerical Simulation
Decrease
simulation

ASJC Scopus subject areas

  • Statistical and Nonlinear Physics
  • Statistics and Probability
  • Condensed Matter Physics

Cite this

Rheology of dense granular flows for elongated particles. / Nagy, Dániel B.; Claudin, Philippe; Börzsönyi, T.; Somfai, Ellák.

In: Physical Review E, Vol. 96, No. 6, 062903, 04.12.2017.

Research output: Contribution to journalArticle

Nagy, Dániel B. ; Claudin, Philippe ; Börzsönyi, T. ; Somfai, Ellák. / Rheology of dense granular flows for elongated particles. In: Physical Review E. 2017 ; Vol. 96, No. 6.
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