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

Xiaolong Yin, Sankaran Sundaresan

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113 Scopus citations


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
Issue number6
StatePublished - Jun 2009

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Environmental Engineering
  • General Chemical Engineering


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


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