Direct numerical simulations of dynamic gas-solid suspensions

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Abstract

Direct numerical simulation results for gas flow through dynamic suspensions of spherical particles is reported. The simulations are performed using an immersed boundary method, with careful correction for the grid resolution effect. The flow systems we have studied vary with mean flow Reynolds number, solids volume fraction, as well as particle/gas density ratio. On the basis of the simulation results, the effect of particle mobility on the gas-solid drag force is analyzed and introduced into the existing drag correlation that was derived from simulations of stationary particles. This mobility effect is characterized by the granular temperature, which is a result of the particle velocity fluctuation. The modified drag correlation is considered so-far the most accurate expression for the interphase momentum exchange in computational fluid dynamics models, in which the gas-solid interactions are not directly resolved.
Original languageEnglish
Pages (from-to)1958-1969
JournalAIChE Journal
Volume62
Issue number6
DOIs
Publication statusPublished - Jun 2016

Keywords

  • direct numerical simulation
  • drag correlation
  • moving particles

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