Stress transmission in systems of faceted particles in a silo: the roles of filling rate and particle aspect ratio

Acevedo, M.F. Buitrago; Zuriguel, Iker; Maza, Diego; Pagonabarraga, Ignacio; Alonso‐Marroquín, Fernando; Hidalgo, R. C.

doi:10.1007/s10035-014-0509-1

Cited by 12 publications

(4 citation statements)

References 56 publications

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“…This is done in three different scenarios: (a) immobile dumbbells in a static pile at a radial distance of 10 D s , (b) dumbbells at a radial distance of 10 D s that are flowing out of the silo, and (c) dumbbells conforming a clogging arch. Clearly, the particles prefer to orient horizontally irrespective of D b /D s ratio in a static pile (figure 5(a)), a behavior that is coherent with the one found in a static pile of elongated rods (aspect ratio 5) [23]. Dissimilarly, figure 5(b) reveals that, irrespective of D b /D s , the alignment distribution of flowing dumbbells displays a maximum at an angle close to Ψ = π/4 and a minimum for Ψ = 3π/4.…”

Section: Resultssupporting

confidence: 76%

Clogging phenomena in a system of asymmetric dumbbells

Reddy

Zuriguel

et al. 2021

J. Stat. Mech.

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We report numerical results aiming to unveil the role that the shape of asymmetric dumbbells has on the emergence of clogging in a two dimensional silo. To this end, dumbbells are designed adjoining two discs of different diameter giving rise to what are known as snowman shaped particles. Then, simulations performed for several outlet widths reveal that the standard case of a dumbbell conformed by two equally sized discs, is the one for which the system clogs more frequently. In this way, as the size difference among the two discs becomes greater, the system evolves from a dumbbell-like to a disc-like behavior. This phenomenon correlates very well with the evolution of several properties of the clogged arches, such as regularity or particles pressure. Finally, the analysis of the orientations of clogged dumbbells reveals a strong alignment of their long axis with the exit direction which seems to be barely dependent on the dumbbell asymmetry and the outlet size.

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Section: Resultssupporting

confidence: 76%

Clogging phenomena in a system of asymmetric dumbbells

Reddy

Zuriguel

et al. 2021

J. Stat. Mech.

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“…The discrete element method, based on spherical polygons, was then validated with experimental results. Experimental and numerical results are given for particle alignment and stress distribution in faceted granular fillers deposited in small-scale two-dimensional silos [17]. Donev proposed an algorithm applied to systems of hard ellipsoids and ellipsoids [18].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Microscopic Damage Evolution of Functional Groove in Cageless Bearings

et al. 2023

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Bearings with partial function grooves as cageless bearings related to magnetic floating bearing protection have characteristics, such as fast offsetting of the impact force caused by rotor fall, and they gradually become important parts of ultra clean and cryogenic transportation systems. However, the functional failure mechanism of the bearing, which is caused by functional groove wear, is not clear. Therefore, this paper establishes a force–motion intrinsic model of particles inside the functional groove, which is based on the discrete element method, which it itself combined with the functional groove damage evolution trend analysis. Then, a hyper-quadratic surface model of inter-particle contact is established to simulate the time-varying friction coefficient of the functional groove by combining particles of different sizes to form particle clusters. Additionally, as the boundary condition, EDEM is used to solve the contact motion state of rolling element rolling through the functional groove for one week to obtain the overlap between particles and contact force change law. The results show that the wide side of the functional groove wears more seriously than the narrow side, and the rolling element leaves the functional groove with more impact than when it enters the functional groove, and the functional groove wears more seriously. In this paper, through the study of local functional groove wear of cageless ball bearing, we propose to characterize the damage extension of functional groove by using the number of particle fracture and motion trend in discrete element method, and this study provides theoretical guidance for the design of cageless bearings.

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“…In addition, particle elongation may cause regions of particle alignment (Lumay & Vandewalle 2006), leading to force transmission in the lateral direction being less favoured than transfer in the normal direction. As a result, force saturation is hindered (Hidalgo et al 2010;Acevedo et al 2014). In a significant attempt to describe non-spherical particle flows, Huthmann, Aspelmeier & Zippelius (1999) developed a kinetic theory of hard needle-shaped particles, which is strictly restricted to low and moderate solid fractions due to the assumptions of binary collisions and a homogeneous cooling state.…”

mentioning

confidence: 99%

Computational study of granular shear flows of dry flexible fibres using the discrete element method

et al. 2015

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In this study, shear flows of dry flexible fibres are numerically modelled using the discrete element method (DEM), and the effects of fibre properties on the flow behaviour and solid-phase stresses are explored. In the DEM simulations, a fibre is formed by connecting a number of spheres in a straight line using deformable and elastic bonds. The forces and moments induced by the bond deformation resist the relative normal, tangential, bending and torsional movements between two bonded spheres. The bond or deforming stiffness determines the flexibility of the fibres and the bond damping accounts for the energy dissipation in the fibre vibration. The simulation results show that elastically bonded fibres have smaller effective coefficients of restitution than rigidly connected fibres. Thus, smaller solid-phase stresses are obtained for flexible fibres, particularly with bond damping, compared with rigid fibres. Frictionless fibres tend to align with a small angle from the flow direction as the solid volume fraction increases, and fibre deformation is minimized due to the alignment. However, jamming, with a corresponding sharp stress increase, large fibre deformation and dense contact force network, occurs for fibres with friction at high solid volume fractions. It is also found that jamming is more prevalent in dense flows with larger fibre friction coefficient, rougher surface, larger stiffness and larger aspect ratio.

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Stress transmission in systems of faceted particles in a silo: the roles of filling rate and particle aspect ratio

Cited by 12 publications

References 56 publications

Clogging phenomena in a system of asymmetric dumbbells

Clogging phenomena in a system of asymmetric dumbbells

Characterization of Microscopic Damage Evolution of Functional Groove in Cageless Bearings

Computational study of granular shear flows of dry flexible fibres using the discrete element method

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