The flow of granular materials—II Velocity distributions in slow flow

Tüzün, U.; Houlsby, G. T.; Nedderman, R.M.; Savage, Stuart B.

doi:10.1016/0009-2509(82)80042-0

Cited by 126 publications

(38 citation statements)

References 53 publications

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“…Large velocities in the radial direction concentrate at the two sides of the orifice. These results are qualitatively consistent with the previous experimental and numerical observations for such a hopper flow [23][24][25], [26, pp. 298-372].…”

Section: Microscopic Analysissupporting

confidence: 93%

Micromechanic modeling and analysis of unsteady-state granular flow in a cylindrical hopper

Zhu

2005

J Eng Math

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This paper presents a numerical study of the micro-and macro-dynamic behavior of the unsteady-state granular flow in a cylindrical hopper with flat bottom by means of a modified discrete-element method (DEM) and an averaging method. The results show that the trends of the distributions of the microscopic properties such as the velocity and forces, and the macroscopic properties such as the velocity, mass density, stress and couple stress of the unsteady-state hopper flow are similar to those of steady-state hopper flow, and do not change much with the discharge of particles. However, the magnitudes of the macroscopic properties in different regions have different rates of variation. In particular, the magnitudes of the two normal stresses vary little with time in the orifice region, but decrease in other regions. The magnitude of the shear stress decreases with time when far from the bottom wall and central axis of the hopper. The results also indicate that DEM can capture the key features of the granular flow, and facilitated with a proper averaging method, can also generate information helpful to the test and development of an appropriate continuum model for granular flow.

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Section: Microscopic Analysissupporting

confidence: 93%

Micromechanic modeling and analysis of unsteady-state granular flow in a cylindrical hopper

Zhu

2005

J Eng Math

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“…Much of the early literature on granular flows has been reviewed by Nedderman et al (1982); Tüzün et al (1982); Savage et al (1983). It can be learned from these reviews, and more recent work, that the flow of particles in hoppers shows a strong dependence on position.…”

Section: Granular Flowmentioning

confidence: 99%

Measurements of granular flows in two-dimensional hoppers by particle image velocimetry. Part I: experimental method and results

Steingart

Evans

2005

Chemical Engineering Science

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“…At the frontier between physics and mechanics, the flow of granular materials has become a very active research domain [1,2,3,4,5,6,7,8,9]. The behaviour of assemblies of grains can be very complex even in the simple case of dry cohesionless particles.…”

Section: Introductionmentioning

confidence: 99%

On dense granular flows

Midi¹

2004

Eur. Phys. J. E

1,612

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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The flow of granular materials—II Velocity distributions in slow flow

Cited by 126 publications

References 53 publications

Micromechanic modeling and analysis of unsteady-state granular flow in a cylindrical hopper

Micromechanic modeling and analysis of unsteady-state granular flow in a cylindrical hopper

Measurements of granular flows in two-dimensional hoppers by particle image velocimetry. Part I: experimental method and results

On dense granular flows

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