Title: Dense suspensions - solid-liquid interactions at the particle scale

Authors: J.J. Derksen

Addresses: Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta, T6G 2G6 Canada

Abstract: Flows of solid-liquid suspensions span a multi-dimensional parameter space, with coordinates such as the Stokes number, the solids volume fraction, the density ratio, and Reynolds numbers. We are interested in systems with appreciable inertia effects - i.e., non-zero Stokes and Reynolds numbers - having density ratios of the order of one (typical for solid-liquid systems) and solids volume fractions of at least 0.1. Additional effects include strongly inhomogeneous solids distributions, non-Newtonian liquids, and sticky particles that tend to aggregate. This leads to a rich spectrum of interactions at the scale of individual particles. To reveal these we perform direct simulations of collections of a few thousand of particles carried by a liquid flow with resolution of the solid-liquid interfaces. For this we use the lattice-Boltzmann method supplemented with an immersed boundary approach.

Keywords: multiphase flow; solid-liquid suspensions; direct numerical simulation; DNS; LBM; lattice-Boltzmann method; immersed boundary method; mesoscopic modelling; particle-turbulence interaction; aggregation; collision modelling.

DOI: 10.1504/PCFD.2012.047453

Progress in Computational Fluid Dynamics, An International Journal, 2012 Vol.12 No.2/3, pp.103 - 111

Published online: 25 Nov 2014 *

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