Abstract
A computational model is presented for the simulation of solid/liquid mixing when neutrally buoyant solids are continuously dropped as a stream from above into a tank of liquid. Transient, two-phase calculations are performed for a two-dimensional model using a finite volume, Eulerian–Eulerian approach. The momentum equations for both phases are adapted to include particle added mass and lift terms and the standard drag force for spherical particles is modified to include hindered settling effects. A solids pressure formulation is used to prevent excessive solids volume fractions above that for maximum packing. Two-dimensional predictions of mixing agree well with experimental results for dispersion in a stationary liquid contained between two closely spaced parallel plates. Mixing of a particle stream falling into a horizontal channel flow is predicted to reduce the maximum volume fraction and depth of penetration of the particle plume compared to corresponding values for the stationary system.
Published Version
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