Experimental and numerical investigation of sands and Geldart A biomass co-fluidization

Liqiang Lu*, Jia Yu, Xi Gao, Yupeng Xu, Mehrdad Shahnam, William A. Rogers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Scopus citations


This article investigated the fluidization of sands and small Geldart A biomass mixtures. The mixture fluidized like Geldart A type particles with a uniform bed expansion regime before bubbling. The video recorded color distance between pure sands and sands–biomass mixtures was used to estimate the sands–biomass mixing. The coarse-grained computational fluid dynamics–discrete element method with a hybrid drag model which couples the Syamlal–O'Brien drag and a filtered drag can capture the mixing while the simulation with Gidaspow drag predicted a segregated bed. The simulations were further validated with experimental measured pressure drops. The time averaged pressure drop equals the weight of the bed material, however, its fluctuation is about three times of the bed material fluctuation.

Original languageEnglish
Article numbere16969
JournalAICHE Journal
Issue number6
StatePublished - 1 Jun 2020
Externally publishedYes


  • biomass
  • coarse-grained CFD–DEM
  • drag model
  • filtered model
  • fluidized bed


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