Vane rheology of cohesionless glass beads

R. C. Daniel, A. P. Poloski, A. E. Sáez

Research output: Contribution to journalArticlepeer-review

14 Scopus citations


The rheology of a single coarse granular powder has been studied with shear vane rotational viscometry. The torque required to maintain constant rotation of a vane tool in a loose bed of glass beads (with a mean particle size of 203 μm) is measured as a function of vane immersion depth and rotational speed. The resulting torque profiles exhibit both Coulombic behavior at low rotational rates and fluid-like, collisional behavior at high rotational rates. Analyzing vane shaft and end effects allows the flow dynamics at the cylindrical and top and bottom disk surfaces of vane rotation to be determined. Disk surfaces show a uniform torque profile consistent with Coulombic friction over most of the rotational rates studied. In contrast, cylindrical surfaces show both frictional and collisional torque contributions, with significant dynamic torque increases at deep immersion depths and fast vane rotation.

Original languageEnglish (US)
Pages (from-to)237-248
Number of pages12
JournalPowder Technology
Issue number3
StatePublished - Feb 12 2008


  • Cohesionless powders
  • Friction
  • Granular rheology
  • Shear vane

ASJC Scopus subject areas

  • Chemical Engineering(all)


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