Modelling the hydrodynamics of gas-solid suspension in downers

H. Jian, R. Ocone

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

We modify the model developed by Ocone et al. [AIChE J. 3(8) (1993)] to include gas phase turbulence and then we test its predictive capabilities in the down flow of air and sand particle suspensions. Subsequently the flow of a diverse solid, namely fluid catalytic cracking (FCC) catalyst, is studied; the computational results for FCC show poor agreement with the experiments obtained by Cheng et al. [Chem. Eng. Sci. 54 (1999) 2019] and Ball and Zhu [Powder Technol. 114 (2000) 96]. However, when a counter-diffusive solid concentration term [Trans. IChemE 78 (2000) 860] is considered in the solid stress tensor, very good agreement with experimental data is observed. Furthermore, the effect of gravity, fluid turbulence, pressure drop and drag force is explored. © 2003 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)73-81
Number of pages9
JournalPowder Technology
Volume138
Issue number2-3
DOIs
Publication statusPublished - 10 Dec 2003

Keywords

  • Cohesion
  • Downer reactors
  • Downflow
  • Fluid cracking catalyst

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