Particle scale modelling of the multiphase flow in a dense medium cyclone: Effect of medium-to-coal ratio

Kaiwei Chu, Jiang Chen, Aibing Yu, Andrew Vince

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The effect of solids loading ratio or the medium-to-coal (M:C) ratio is the most important operational parameter of the Dense Medium Cyclones (DMC) that are widely used in the coal industry to upgrade the run-of-mine coal by separating gangue from product coal. However, its effect is still not well understood so far, since the flow pattern within a DMC is complicated due to the size and density distributions of the feed and process medium solids, and the turbulent vortex formed. Recently, it is shown that the particle-laden flow in a DMC can be modelled by the so-called combined Computational Fluid Dynamics (CFD) and Discrete Element Method (DEM) (CFD-DEM) in which the flow of coal particles is modelled by DEM which applies Newton s laws of motion to individual particles and that of medium flow by the conventional CFD which solves the local-averaged Navier-Stokes equations, allowing consideration of particle-fluid mutual interaction and particle-particle collisions. In this work, the effect of medium-to-coal (M:C) ratio is studied by a two-way coupling CFD-DEM approach for a large diameter DMC. The flow structure, and particle-particle and particle-fluid forces are analysed to understand the fundamentals governing this effect. The results suggest that the solids volume fraction of 20 (or M:C ratio of 4 by volume) is a critical point for the DMC performance under the conditions considered.
Original languageEnglish
Title of host publicationPowders and Grains 2013: Proceedings of the 7th International Conference on Micromechanics of Granular Media
EditorsAibing Yu, Kejun Dong, Runyu Yang, Stefan Luding
Place of PublicationMelville NY USA
PublisherAmerican Institute of Physics
Pages1182 - 1185
Number of pages4
ISBN (Print)9780735411661
Publication statusPublished - 2013
Externally publishedYes
EventPowders and Grains 2013 - Sydney, Australia
Duration: 8 Jul 201312 Jul 2013
Conference number: 7th


ConferencePowders and Grains 2013
Internet address

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