DEM-CFD study of the filter cake formation process due to non-spherical particles_中国颗粒学会

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Partic. vol. 53 pp. 48-57 (December 2020)
doi: 10.1016/j.partic.2020.01.003

DEM-CFD study of the filter cake formation process due to non-spherical particles

Ruturaj Deshpandea,b,e,*, Sergiy Antonyukb, OlegIlieva

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ruturaj.deshpande@itwm.fraunhofer.de

Highlights

    • Orientation of a sedimenting particle is considered. • Orientation projects minimum possible area on plane normal to gravitational axis. • Sedimentation velocity of a suspension increases with particle sphericity. • Final void fraction of the filter cake increases with decreased particle sphericity. • Interdependency analysis of particle sphericity, void fraction, and pressure drop.

Abstract

The formation of a filter cake during the filtration of a suspension with non-spherical particles is studied using a multi-sphere model in a simulation that couples the discrete element method with computational fluid dynamics. The implementation of the coupling with a drag model that considers orientation, sphericity, and the presence of surrounding particles for non-spherical particles is tested for single particles and suspensions by comparing the terminal velocities with empirical results. Phenomena predicted in the simulations, such as the presence or absence of initial oscillations and changes in the orientation of a particle, are consistent with experimental observations reported in the literature. The variation in the void fraction of a filter cake with respect to the particle sphericity is obtained and compared with experimental trends reported in the literature. Furthermore, complex interdependencies of the particle sphericity, void fraction, and pressure drop of a filter cake for a wide range of fluid conditions are investigated.

Keywords

Filter cake formation; Discrete element method–computational fluid dynamics simulation; Non-spherical particles