Evaluation of the effect of wall boundary conditions on numerical simulations of circulating fluidized beds

Lei Kong, Chao Zhang, Jesse Zhu

Research output: Journal PublicationArticlepeer-review

26 Citations (Scopus)

Abstract

A computational fluid dynamics (CFD) modeling of the gas-solids two-phase flow in a circulating fluidized bed (CFB) riser is carried out. The Eularian-Eularian method with the kinetic theory of granular flow is used to solve the gas-solids two-phase flow in the CFB riser. The wall boundary condition of the riser is defined based on the Johnson and Jackson wall boundary theory (Johnson & Jackson, 1987) with specularity coefficient and particle-wall restitution coefficient. The numerical results show that these two coefficients in the wall boundary condition play a major role in the predicted solids lateral velocity, which affects the solid particle distribution in the CFB riser. And the effect of each of the two coefficients on the solids distribution also depends on the other one. The generality of the CFD model is further validated under different operating conditions of the CFB riser.

Original languageEnglish
Pages (from-to)114-123
Number of pages10
JournalParticuology
Volume13
Issue number1
DOIs
Publication statusPublished - Apr 2014
Externally publishedYes

Keywords

  • CFD
  • Circulating fluidized bed
  • Gas-solids two-phase flow
  • Particle-wall restitution coefficient
  • Specularity coefficient
  • Wall boundary condition

ASJC Scopus subject areas

  • Chemical Engineering (all)
  • Materials Science (all)

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