NUMERICAL MODELLING OF MULTIPHASE PARTICULATE FLOW AND ITS APPLICATION TO SEDIMENTATION

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Abstract
A numerical model has been developed to simulate the batch settling of a suspension of a particulate size distribution initially with a uniform concentration in a host fluid. The various particle size fractions are represented as separate phases with distinct concentration and velocities. This permits the larger particles to move to the bottom of the vessel and pack. As the particles settle all but the smallest will not penetrate the lower levels of the vessel. The packing behaviour is represented in detail via the approach of Ouchiyama and Tanaka. The numerical implementation is based upon the control volume techniques elucidated by Patankar, although the algorithm contains a number of original features. The model is compared favourably with the experimental results of Holdich, although further work is required to adequately represent the settling of compressible materials.

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