Fluid-particle drag in low-reynolds-number polydisperse gas-solid suspensions

Xiaolong Yin, Sankaran Sundaresan

Research output: Contribution to journalArticle

78 Scopus citations

Abstract

Lattice-Boltzmann simulations of low-Reynolds-number fluid flow in bidisperse fixed beds and suspensions with particle - particle relative motions have been performed. The particles are spherical and are intimately mixed. The total volume fraction of the suspension was varied between 0.1 and 0.4, the volume fraction ratio 4φ 12 from 1:1 to 1:6, and the particle size ratio d 1/d 2 from 1:1.5 to 1:4. A drag law with improved accuracy has been established for bidisperse fixed beds. For suspensions with particle-particle relative motions, the hydrodynamic particle - particle drag representing the momentum transfer between particle species through hydrodynamic interaction is found to be an important contribution to the net fluid-particle drag. It has a logarithmic dependence on the lubrication cutoff distance and can be fit as the harmonic mean of the drag forces in bidisperse fixed beds. The proposed drag laws for bidisperse fixed beds and suspensions are generalized to polydisperse suspensions with three or more particle species.

Original languageEnglish (US)
Pages (from-to)1352-1368
Number of pages17
JournalAIChE Journal
Volume55
Issue number6
DOIs
StatePublished - Jun 1 2009

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)

Keywords

  • Fluid-particle drag
  • Gas-solid suspensions
  • Low reynolds number
  • Particle size distribution
  • Polydisperse

Fingerprint Dive into the research topics of 'Fluid-particle drag in low-reynolds-number polydisperse gas-solid suspensions'. Together they form a unique fingerprint.

Cite this