Liquid co-fluidization of cylinders and spheres

Jacobus J. Derksen* (Corresponding Author)

*Corresponding author for this work

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Liquid fluidization of mixtures of solid particles of spherical and cylindrical shape has been numerically simulated. The simulations explicitly resolve the solid-liquid interfaces by means of an immersed boundary method implemented in a lattice-Boltzmann flow solver. A soft collision algorithm deals with particle-particle contacts and close-range hydrodynamic interaction. The systems studied have an overall solids volume fraction of 0.40 with 5% to 35% of the overall solids volume contained in the cylinders. One focus of the study is on the effect of the length over diameter aspect ratio (that has been varied between 4 and 10) of the cylinders on the co-fluidization behavior. The average slip velocity of the cylinders only weakly depends on the fraction of cylinder volume in the solid particle mixture. The cylinders do stir the system with velocity fluctuation levels increasing if the number of cylinders relative to the number of spheres is increased. When co-fluidized, the taller cylinders preferentially orient
vertically, as they also do in cylinder-only fluidization.
Original languageEnglish
Pages (from-to)2623-2631
Number of pages8
JournalCanadian journal of chemical engineering
Issue number9
Early online date7 Apr 2022
Publication statusPublished - 7 Apr 2022

Bibliographical note

open access via UoA Wiley agreement
The peer review history for this article is available at

Data Availability Statement

Data available on request from the authors


  • Particle-resolved simulation
  • non-spherical particles
  • lattice-Boltzmann method
  • liquid fluidization


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