Theoretical and numerical studies on the flow multiplicity phenomenon for gas-solids two-phase flows in CFB risers

B. Peng, C. Zhang, J. Zhu

Research output: Journal PublicationArticlepeer-review

13 Citations (Scopus)

Abstract

The dependence of the fully-developed flow profiles on the inlet flow conditions for gas-solids two-phase flows, i.e. the flow multiplicity phenomenon, in circulating fluidized bed (CFB) risers was proposed and discussed in this article. The flow multiplicity phenomenon for gas-solids two-phase flows was first proved mathematically based on the conservation equations of mass and momentum. Then the CFD model using Eulerian-Eulerian approach with k-ε turbulence model for each phase was further adopted to analyze the details of this flow multiplicity phenomenon. It is theoretically and numerically revealed that for gas-solids two-phase flows, the flow profiles in the fully-developed region are always dominated by the flow profiles at the inlet. The solids concentration profile is closely coupled with the velocity profile, and the inlet solids concentration and velocity profiles can largely influence the fully-developed concentration and velocity profiles.

Original languageEnglish
Pages (from-to)660-670
Number of pages11
JournalInternational Journal of Multiphase Flow
Volume37
Issue number6
DOIs
Publication statusPublished - Jul 2011
Externally publishedYes

Keywords

  • CFB riser
  • CFD simulation Eulerian-Eulerian approach
  • Flow multiplicity phenomenon
  • Gas-solids two-phase flow

ASJC Scopus subject areas

  • Mechanical Engineering
  • Physics and Astronomy (all)
  • Fluid Flow and Transfer Processes

Fingerprint

Dive into the research topics of 'Theoretical and numerical studies on the flow multiplicity phenomenon for gas-solids two-phase flows in CFB risers'. Together they form a unique fingerprint.

Cite this