Simulation of rotating drum experiments using non-circular particles

Buchholtz, Volkhard; Pöschel, Thorsten; Tillemans, Hans-Jürgen

doi:10.1016/0378-4371(95)00045-9

Cited by 42 publications

(24 citation statements)

References 19 publications

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“…The flows of smooth-shaped nonspherical particles (e.g., spheroid and cuboids) were also studied in various geometries [28,29,33,40,[55][56][57][58][59][60][61][62][63][64][65][66]. Those works reported that strong shear strength increases away from the spherical shape.…”

Section: B Influence Of Grain Shapementioning

confidence: 99%

Discrete simulation of dense flows of polyhedral grains down a rough inclined plane

Azéma¹,

Descantes²,

Roquet³

et al. 2012

Phys. Rev. E

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The influence of grain angularity on the properties of dense flows down a rough inclined plane are investigated. Three-dimensional numerical simulations using the nonsmooth contact dynamics method are carried out with both spherical (rounded) and polyhedral (angular) grain assemblies. Both sphere and polyhedra assemblies abide by the flow start and stop laws, although much higher tilt angle values are required to trigger polyhedral grain flow. In the dense permanent flow regime, both systems show similarities in the bulk of the material (away from the top free surface and the substrate), such as uniform values of the solid fraction, inertial number and coordination number, or linear dependency of the solid fraction and effective friction coefficient with the inertial number. However, discrepancies are also observed between spherical and polyhedral particle flows. A dead (or nearly arrested) zone appears in polyhedral grain flows close to the rough bottom surface, reflected by locally concave velocity profiles, locally larger coordination number and solid fraction values, smaller inertial number values. This dead zone disappears for smooth bottom surfaces. In addition, unlike sphere assemblies, polyhedral grain assemblies exhibit significant normal stress differences, which increase close to the substrate.

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Section: B Influence Of Grain Shapementioning

confidence: 99%

Discrete simulation of dense flows of polyhedral grains down a rough inclined plane

Azéma¹,

Descantes²,

Roquet³

et al. 2012

Phys. Rev. E

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show abstract

“…In the last ten-fifteen years, these methods found many applications in the mechanics of bulk materials, i.e. flow behaviour and discharge of silos [8,49,50], filling and packing [111], shearing [25,35,47,61,103], heap formation [13,36,65], bed configuration and loading conditions in fall mills [63,69,105], compression behaviour [68,78], mixing and transportation [12,27,44,52,54,107], fluidised bed processes [31,40,41,58,66,90,102,104,110,112], heat exchange processes [41,50].…”

Section: Introductionmentioning

confidence: 99%

Energy absorption during compression and impact of dry elastic-plastic spherical granules

et al. 2010

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The discrete modelling and understanding of the particle dynamics in fluidized bed apparatuses, mixers, mills and others are based on the knowledge about the physical properties of particles and their mechanical behaviour during slow, fast and repeated stressing. In this paper model parameters (modulus of elasticity, stiffness, yield pressure, restitution coefficient and strength) of spherical granules ( γ -Al 2 O 3 , zeolites 4A and 13X, sodium benzoate) with different mechanical behaviour have been measured by single particle compression and impact tests. Starting with the elastic compression behaviour of granules as described by Hertz theory, a new contact model was developed to describe the force-displacement behaviour of elastic-plastic granules. The aim of this work is to understand the energy absorption during compression (slow stressing velocity of 0.02 mm/s) and impact (the impact velocity of 0.5-4.5 m/s) of granules. For all examined granules the estimated energy absorption during the impact is found to be far lower than that during compression. Moreover, the measured restitution coefficient is independent of the impact velocity in the examined range and independent of the load intensity by compression (i.e. maximum compressive load). In the case of repeated loading with a constant load amplitude, the granules show cyclic hardening with increasing restitution coefficient up to a certain saturation in the plastic deformation. A model was proposed to describe the increase of the contact stiffness with the number of cycles. When the load amplitude is subsequently increased, further plastic deformation takes place and the restitution coefficient strongly decreases.

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“…For short-range particle interactions the majority of these force evaluations is unnecessary since the corresponding particles are located very distant from each other. For approximatively equal-sized particles each single particle can 54 2 Molecular Dynamics be in contact with not more than about 6 other particles, hence, only about 3N = 3,000 force computations are necessary. For the case of the naive force computation scheme (which was applied in the previous section), at least 166 times more pair interactions are computed than necessary -what a waste of computer time!…”

Section: Algorithmic Complexity Of the Force Summationmentioning

confidence: 99%

Computational Granular Dynamics

2005

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Simulation of rotating drum experiments using non-circular particles

Cited by 42 publications

References 19 publications

Discrete simulation of dense flows of polyhedral grains down a rough inclined plane

Discrete simulation of dense flows of polyhedral grains down a rough inclined plane

Energy absorption during compression and impact of dry elastic-plastic spherical granules

Computational Granular Dynamics

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