Segregation and dispersion of binary solids in liquid fluidised beds: a CFD-DEM study

Zhengbiao Peng, Jyeshtharaj B. Joshi, Behdad Moghtaderi, Md Shakhaoath Khan, Geoffrey M. Evans, Elham Doroodchi

Research output: Contribution to journalArticleResearchpeer-review

40 Citations (Scopus)

Abstract

Liquid fluidised beds often operate with particles of different sizes and densities, encountering partial or complete segregation of solid particles at certain operating conditions. In this study, the segregation and dispersion of binary particle species of the same size but different densities in liquid fluidised beds have been investigated based on the analysis of computational fluid dynamics - discrete element method (CFD-DEM) simulation results.The vertical fluid drag force acting on the particles was found to be responsible for the particle segregation. The mechanisms governing the particle dispersion strongly depended upon the solid-liquid two-phase flow regime, which transited from pseudo-homogeneous to heterogeneous when the superficial liquid velocity reached a certain value. In the homogeneous or pseudo-homogeneous flow regime (Rep≤40, ∈L, ave≤0.74), particle collisions acted as the main mechanism that drove the dispersion of particles. However, after the system became heterogeneous, the magnitude of the vertical collision force decreased towards zero and correspondingly, the magnitude of the vertical fluid drag force was approaching that of the particle net weight force as the superficial liquid velocity increased. Therefore, in the heterogeneous flow regime (Rep>40, ∈L, ave>0.74), the local turbulence of the fluid flow and particle collisions (if there were any) were found to be the main mechanisms that drove the dispersion of particles in all directions. The dispersion coefficient of individual particles varied significantly throughout the system in the heterogeneous flow regime. The simulation results reasonably agreed with the experimental data and the prediction results by existing correlations.

Original languageEnglish
Pages (from-to)65-83
Number of pages19
JournalChemical Engineering Science
Volume152
DOIs
Publication statusPublished - 2 Oct 2016
Externally publishedYes

Keywords

  • Binary mixture of particles
  • CFD-DEM
  • Dispersion
  • Force analysis
  • Liquid fluidised bed
  • Segregation

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