Boundary effects on the angle of repose in rotating cylinders

Dury, Christian M.; Ristow, Gerald H.; Moss, Jamie L.; Nakagawa, Masami

doi:10.1103/physreve.57.4491

Cited by 120 publications

(89 citation statements)

References 26 publications

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“…• , which is in reasonable agreement with previous experiments on spherical or nearly spherical grains [2,3]. In contrast dimers display a much larger angle of stability of Θ s = 62…”

supporting

confidence: 81%

“…The effect of dispersion in the sizes of individual spherical grains has been considered [2], as well as the effect of varying the roughness of the grain surface [3] or of having nonspherical grains [4,5]. Anisotropic or elongated grains have attracted interest previously, but it has generally been in the context of the flow of feed grains through a hopper [6].…”

mentioning

confidence: 99%

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Effect of grain anisotropy on ordering, stability and dynamics in granular systems

Olson¹,

Reichhardt²,

McCloskey³

et al. 2002

Europhys. Lett.

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With simulation and experiment we examine the effect of grain anisotropy on the angle of repose in a two-dimensional geometry. We find that the structure of the granular packing can be directly controlled by changing the aspect ratio of the grains, and that the specific type of order strongly affects the angle of repose and the resulting dynamics. The angle of repose is largest for dimer grains, and is smaller for both monomer and trimer grains. The motion of a collapsing grain heap consists of large scale collective shear when monomer grains are considered, but occurs via tumbling of grains on the surface for dimers, and via disorderly bulk tumbling for trimer grains. PACS numbers: 45.70. Mg, 81.05.Rm, Granular assemblies have attracted much recent attention since they are a model system in which collective nonequilibrium dynamics, compaction, pattern formation, frustration, nonlinear flows, and jamming can be readily examined [1]. The behavior they display is relevant to a diverse array of physical systems, including powders, colloids, liquids, and vortex matter in superconductors. In addition, an understanding of granular mechanics will be valuable for increasing the efficiency of a wide range of industrial processes and applications. A fundamental question that arises is the relation between the mechanical response of the granular media and the ordering of the individual grains. The nature of the closepacked ordering in 3D of different types of granular media is itself an open issue. In this work we study a simple system of granular assemblies confined in a 2D plane and show that specific types of ordering can be controllably produced by tuning the anisotropy of the grains. The resulting structure of the granular pack has a profound effect on the angle of repose and the granular dynamics.Most previous work on the effects of grain geometry has focused on angles of repose for grains that are roughly spherical. The effect of dispersion in the sizes of individual spherical grains has been considered [2], as well as the effect of varying the roughness of the grain surface [3] or of having nonspherical grains [4,5]. Anisotropic or elongated grains have attracted interest previously, but it has generally been in the context of the flow of feed grains through a hopper [6]. Only one systematic study has considered the effect of gradual elongation of the grains on the angles of repose. In Ref.[5], it was observed that as the grain is elongated continuously from a monomer to a dimer, the angle of repose increases monotonically. The grain shape was continuously varied, so it would not be possible to form an ordered lattice with the same lattice constant using any two grain geometries considered.In this work we consider with experiments and simulations a system composed of grains that can always be packed into a triangular lattice of monomers, but are individually composed of monomers, dimers, or trimers. Some previous simulation studies have focused on fully three-dimensional systems [7,8]. This introduces considerable ...

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“…• , which is in reasonable agreement with previous experiments on spherical or nearly spherical grains [2,3]. In contrast dimers display a much larger angle of stability of Θ s = 62…”

supporting

confidence: 81%

mentioning

confidence: 99%

Effect of grain anisotropy on ordering, stability and dynamics in granular systems

Olson¹,

Reichhardt²,

McCloskey³

et al. 2002

Europhys. Lett.

View full text Add to dashboard Cite

show abstract

“…Accordingly, they have been extensively studied in the past for practical interest and more recently as model system in fundamental studies [9,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84].…”

Section: Surface Flows: Heap Flow and Rotating Drummentioning

confidence: 99%

On dense granular flows

Midi¹

2004

Eur. Phys. J. E

1,644

462

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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 GDR Milieux Divisés. 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 enforces the robust features in each case. Second, a transversal 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, underlines the richness of granular flows and enhances the open problem of defining a single rheology.

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“…It rises with the increase of the rotation speed [8]. And the extra friction between particle and rotating end wall gives larger dynamic angle of repose for materials near the end walls [8][9][10].…”

Section: Introductionmentioning

confidence: 98%

Radial segregation driven by axial migration

Liu¹,

Ge²,

Li³

2013

AIP Conference Proceedings

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Abstract. The mixing of binary particles in a short rotating drum has been studied by performing discrete element simulations. The modeled granular materials were made of particles with same size and density but different color. We observed that the binary granular system inevitably went through a transient radial segregation state before reaching the final homogeneous mixing state. Depending on the filling degree and rotating speed, there exist totally three types of transient segregation patterns. Analysis of the flow field shows that such transient radial segregating phenomena were induced by different axial transporting characteristics of material.

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Boundary effects on the angle of repose in rotating cylinders

Cited by 120 publications

References 26 publications

Effect of grain anisotropy on ordering, stability and dynamics in granular systems

Effect of grain anisotropy on ordering, stability and dynamics in granular systems

On dense granular flows

Radial segregation driven by axial migration

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