Development of a virtual Couette rheometer for aerated granular material

Lyes Ait Ali Yahia, Tobias Matthaeus Piepke, Ross Barrett, Ali Ozel, Raffaella Ocone

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
70 Downloads (Pure)


A novel rheometer to study the behavior of granular materials in an aerated bed of particles has been developed. The device, called the aerated bed virtual Couette rheometer, is shown to be able to measure the shear stresses in the quasi‐static and in the intermediate flow regimes. To validate the instrument, a Newtonian fluid of known viscosity was first sheared. The device was then used for measuring the shear stress of nonaerated glass beads with three ‐3D printed cells of different sizes to validate the optimal radial position, r*, where both shear rate and shear stress are independent of the cell radius. The results for the nonaerated glass beads displayed Coulomb behavior. The same behavior was observed when the bed was aerated. These experiments also showed that for a fixed shear rate the shear stress decreases as the aeration velocity, U. increases.
Original languageEnglish
Article numbere16945
JournalAIChE Journal
Issue number6
Early online date12 Feb 2020
Publication statusPublished - Jun 2020


  • aerated bed
  • glass beads
  • granular materials
  • inertial number
  • rheology

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Chemical Engineering(all)


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