On dense granular flows.
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TLDR
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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Small Solar System Bodies as granular media
Daniel Hestroffer,Paul Sánchez,Lydie Staron,A. Campo Bagatin,Siegfried Eggl,Siegfried Eggl,Wolfgang Losert,Naomi Murdoch,Eric Opsomer,Farhang Radjai,Derek C. Richardson,M. Salazar,Daniel J. Scheeres,Stephen R. Schwartz,Stephen R. Schwartz,Nicolas Taberlet,Hajime Yano +16 more
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Investigation of basal friction effects on impact force from a granular sliding mass to a rigid obstruction
TL;DR: In this paper, an experimental and analytical investigation on the effects of basal friction on flow front velocity and impact force from a granular sliding mass to a rigid obstruction is presented and the results of a series of 2-D flume tests with two different basal friction conditions at different inclination angles, sliding distances, and initial relative densities are presented and discussed.
Journal ArticleDOI
Agglomeration of wet particles in dense granular flows.
Thanh-Trung Vo,Saeid Nezamabadi,Patrick Mutabaruka,Jean-Yves Delenne,Edouard Izard,Roland J.-M. Pellenq,Farhang Radjai +6 more
TL;DR: The granule size is found to be an exponential function of time, reflecting the conservation of the amount of liquid and the decrease of the number of available wet particles inside the flow during agglomeration.
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Shear-induced diffusion in cohesive granular flows: effect of enduring clusters
Matthew Macaulay,Pierre Rognon +1 more
TL;DR: In this paper, the effect of intergranular cohesive forces on the properties of dense granular flows was investigated based on simulated plane shear flows at different inertial and cohesion numbers, in which transverse diffusivities were measured.
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Influence of slope angle on pore pressure generation and kinematics of pyroclastic flows: insights from laboratory experiments
TL;DR: In this article, the influence of slope angle on pore pressure generation and kinematics of fine-rich pyroclastic flows was investigated through laboratory experiments, showing that the degree of autofluidization, caused by air escaping from the substrate interstices into which flow particles settled, was high at all slope angles, however, was reduced at slope angle higher than ∼12° because of the occurrence of a strong deceleration phase that limited the flow duration.
References
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Dynamics of viscoplastic deformation in amorphous solids
Michael L. Falk,James S. Langer +1 more
TL;DR: In this article, a dynamical theory of low-temperature shear deformation in amorphous solids is proposed based on molecular-dynamics simulations of a two-dimensional, two-component non-crystalline system.
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Rapid granular flows
TL;DR: In this article, the authors present a review of the fluid-like behavior of granular solids and, in particular, those flows for which the material is rapidly sheared, and discuss various modeling techniques used to describe the motion of the bulk material.
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Statics and Kinematics of Granular Materials
TL;DR: In this article, Coulomb's method of wedges and differential slices were used to determine the stress and strain rate of Coulomb material, and the conical yield function was used to predict mass flow rate.
Journal ArticleDOI
Granular flow down an inclined plane: Bagnold scaling and rheology
Leonardo E. Silbert,Deniz Ertas,Gary S. Grest,Thomas C. Halsey,Dov Levine,Steven J. Plimpton +5 more
TL;DR: A systematic, large-scale simulation study of granular media in two and three dimensions, investigating the rheology of cohesionless granular particles in inclined plane geometries, finds that a steady-state flow regime exists in which the energy input from gravity balances that dissipated from friction and inelastic collisions is found.