On the role of energy dissipation in a dynamically structured fluidized bed

Victor Francia, Kaiqiao Wu, Marc-Olivier Coppens

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)

Abstract

This work explores the effect of interparticle friction on the stability of a structured bubble flow in gas–solid fluidized beds. We provide a detailed quantification of the evolution of bubble properties at varying frequency, comparing experiments with CFD-DEM (computational fluid dynamics – discrete element modeling) simulations. Friction plays a key role. It creates intermittent solid-like regions that restrict the mobility of solids and endow the flow with enough memory to correlate consecutive nucleation events. As friction decreases, solid-like regions widen, allowing the circulation of solids; simultaneously, bubbles grow, move apart and ultimately break up the structure. CFD-DEM reproduces this phenomenon well in a small bed, but shows qualitative differences in bubble shape and acceleration. These deviations propagate into substantial errors at higher frequency or larger domains displaying multiple bubble rows, which stresses the need for further research to understand the effects of other particle properties, polydispersity and the domain size.

Original languageEnglish
Article number117189
JournalChemical Engineering Science
Volume248
Issue numberPart B
Early online date9 Oct 2021
DOIs
Publication statusPublished - 2 Feb 2022

Keywords

  • Bubbling
  • CFD-DEM
  • Fluidization
  • Friction
  • Intensification
  • Oscillatory flow

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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