The influence of the drag force due to the interstitial gas on granular flows down a chute

Yonghao Zhang, JM Reese

Research output: Contribution to journalArticlepeer-review

Abstract

Fully-developed steady flow of granular material down an inclined chute has been a subject of much research interest, but the effect of the interstitial gas has usually been ignored. In this paper, new expressions for the drag force and energy dissipation caused by the interstitial gas (ignoring the turbulent fluctuations of the gas phase) are derived and used to modify the governing equations derived from the kinetic theory approach for granular-gas mixture hows, where particles are relatively massive so that velocity fluctuations are caused by collisions rather than the gas flow. This new model is applied to fully-developed, steady mixture hows down an inclined chute and the results are compared with other simulations. Our results show that the effect of the interstitial gas plays a significant role in modifying the characteristics of fully developed how. Although the effect of the interstitial gas is less pronounced for large particles than small ones, the flowfields with large particles are still very different from granular flows which do not incorporate any interactions with the interstitial gas.

Original languageEnglish
Pages (from-to)2049-2072
Number of pages24
JournalInternational Journal of Multiphase Flow
Volume26
Issue number12
DOIs
Publication statusPublished - 7 Aug 2000

Keywords

  • granular flow
  • kinetic theory
  • particles
  • chute flow
  • drag force
  • FRICTIONAL LOSSES
  • KINETIC-MODEL
  • SPHERICAL-PARTICLES
  • BOUNDARY-CONDITIONS
  • SHEAR FLOWS
  • DENSE GAS
  • hydrodynamics
  • turbulence
  • interstitial gas
  • mathematical modelling
  • coupling

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