Abstract
A four-way coupling CFD-DEM model is originally developed in this work to investigate the sedimentation of adhesive particles in viscous fluids. In this model, the particles are traced by the discrete element method based on the JKR contacting theory, and the fluid flow is resolved by the lattice Boltzmann method combining with large eddy simulation. Three benchmark problems are first investigated to validate the LBM-LES-DEM scheme, and then the sedimentations of non-adhesive and adhesive particles are further discussed in detail. Results indicate that the drafting-kissing-tumbling process identified during the settling of non-adhesive particles is significantly different from that of adhesive ones, and separation will not happen if the vdW adhesion between particles becomes strong enough. Moreover, the settling of adhesive particles is found to be faster than non-adhesive ones, and this can be reasonably interpreted by the agglomeration effect that takes place during the settling of adhesive particles.
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