On dense granular flows.
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A quantitative comparison between data coming from different experiments in the same geometry identifies the robust features in each case and a transverse analysis of the data across the different configurations allows to identify the relevant dimensionless parameters, the different flow regimes and to propose simple interpretations.Abstract:
The behaviour of dense assemblies of dry grains submitted to continuous shear deformation has been the subject of many experiments and discrete particle simulations. This paper is a collective work carried out among the French research group Groupement de Recherche Milieux Divises (GDR MiDi). It proceeds from the collection of results on steady uniform granular flows obtained by different groups in six different geometries both in experiments and numerical works. The goal is to achieve a coherent presentation of the relevant quantities to be measured i.e. flowing thresholds, kinematic profiles, effective friction, etc. First, a quantitative comparison between data coming from different experiments in the same geometry identifies the robust features in each case. Second, a transverse analysis of the data across the different configurations, allows us to identify the relevant dimensionless parameters, the different flow regimes and to propose simple interpretations. The present work, more than a simple juxtaposition of results, demonstrates the richness of granular flows and underlines the open problem of defining a single rheology.read more
Citations
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A constitutive law for dense granular flows
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TL;DR: Zhu et al. as discussed by the authors provided a summary of the studies based on discrete particle simulation in the past two decades or so, with emphasis on the microdynamics including packing/flow structure and particle-particle, particle-fluid and particle wall interaction forces.
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Rheophysics of dense granular materials: Discrete simulation of plane shear flows
TL;DR: From those dilatancy and friction laws, the constitutive law for dense granular flows is deduced, with a plastic Coulomb term and a viscous Bagnold term, for the limit of rigid grains.
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Flows of Dense Granular Media
Yoël Forterre,Olivier Pouliquen +1 more
TL;DR: In this article, the existence of a dense flow regime characterized by enduring contacts is discussed, and results from experiments and simulations in different configurations support a description in terms of a frictional visco-plastic constitutive law.
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Unifying suspension and granular rheology.
TL;DR: Dense suspension and granular media are unified under a common framework and the results are shown to be compatible with classical empirical models of suspension rheology and provide a clear determination of constitutive laws close to the jamming transition.
References
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Granular flow in a rotating cylindrical drum
Tov Elperin,A. Vikhansky +1 more
TL;DR: In this paper, the authors derived simple equations to describe granular dynamics in a transverse plane and solved these equations analytically in the first-order approximation of the small parameter.
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Slow dense granular flows as a self-induced process
TL;DR: A minimum model is derived and applied to different configurations of granular shear flow based on a stress fluctuation activated process that induces fluctuations in the media that may trigger a shear at some other position.
Journal ArticleDOI
Shear with comminution of a granular material: Microscopic deformations outside the shear band
TL;DR: This slow evolution of the associated characteristic length is observed, indicative of a slow decoupling between the shear band and the rest of the sample, and has important implications for friction laws and earthquake physics.
Journal ArticleDOI
Selection of velocity profile and flow depth in granular flows
Bruno Andreotti,Stéphane Douady +1 more
TL;DR: The dynamics of a two-dimensional pile constituted by spherical grains organized in parallel layers is investigated theoretically and the dependence of this critical angle with the static angle straight phi(s), the restitution coefficient rho, and the moment of inertia J, is investigated.