Experiments and Discrete Element Simulation of the Dosing of Cohesive Powders in a Simplified Geometry

Imole, Olukayode Isaiah; Krijgsman, Dinant; Weinhart, Thomas; Magnanimo, Vanessa; Montes, Bruno E. Chavez; Ramaioli, Marco; Luding, Stefan

doi:10.48550/arxiv.1410.2886

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“…it does not resolve all the details of every single contact, but is designed to represent an ensemble of particles with many contacts in a bulk system. One goal of this study is to present this rich, flexible and multi-purpose granular matter meso-model, which can be calibrated to realistically model ensembles of large numbers of particles [100]. The analytical solution for the contact dissipation is given for contact and non-contact forces both active, but viscosity inactive, in section 3.…”

Section: Mesoscopic Contact Modelmentioning

confidence: 99%

A contact model for sticking of adhesive meso-particles

Singh,

Magnanimo,

Luding

2015

Preprint

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The interaction between visco-elasto-plastic and adhesive particles is the subject of this study, where "meso-particles" are introduced, i.e., simplified particles, whose contact mechanics is not taken into account in all details. A few examples of meso-particles include agglomerates or groups of primary particles, or inhomogeneous particles with micro-structures of the scale of the contact deformation, such as core-shell materials.A simple, flexible contact model for meso-particles is proposed, which allows to model the bulk behavior of assemblies of many particles in both rapid and slow, quasi-static flow situations. An attempt is made to categorize existing contact models for the normal force, discuss all the essential mechanical ingredients that must enter the model (qualitatively) and finally solve it analytically.The model combines a short-ranged, non-contact part (resembling either dry or wet materials) with an elaborate, visco-elasto-plastic and adhesive contact law. Using energy conservation arguments, an analytical expression for the coefficient of restitution is derived in terms of the impact velocity (for pair interactions or, equivalently, without loss of generality, for quasi-static situations in terms of the maximum overlap or confining stress).Adhesive particles (or meso-particles) stick to each other at very low impact velocity, while they rebound less dissipatively with increasing velocity, in agreement with previous studies. For even higher impact velocities an interesting second sticking and rebound regime is reported. The low velocity sticking is due to non-contact adhesive forces, the first rebound regime is due to stronger elastic and kinetic energies with little dissipation, while the high velocity sticking is generated by the non-linearly increasing, history dependent plastic dissipation and adhesive contact force. As the model allows also for a stiff, more elastic core material, this causes the second rebound regime at even higher velocities.

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Section: Mesoscopic Contact Modelmentioning

confidence: 99%