Granular flow fields in vertical high shear mixer granulators

BH Ng, CC Kwan, YL Ding, M Ghadiri, Xianfeng Fan, David Parker

Research output: Contribution to journalArticle

10 Citations (Scopus)


This study aims to elucidate some basic features of the granular flow field in a conical frustum-shaped vertical high shear mixer granulator by using the Positron Emission Particle Tracking technique. The tested range of particle size (d(50) = 23, 43, and 60 mu m) and shape as quantified by the angle of internal friction (26 degrees and 38 degrees) have a negligible effect on the granular flow field in the mixer granulator. Density of particle imposes great influence on the flow field where reducing density from 2600 to 700 kg m(-3) increase the tangential velocity by 1.95 time. Decreasing fill level from 3.5 to 0.9 kg increases the tangential velocity by a factor of 1.19. No obvious discrepancy in the solids motion is seen between machines of I and 5 L capacity and both machines have similar mixing and dispersion with constant tip speed criterion. (c) 2007 American Institute of Chemical Engineers.
Original languageEnglish
Pages (from-to)415-426
Number of pages12
JournalAIChE Journal
Issue number2
Publication statusPublished - 1 Jan 2008


  • high shear granulator
  • solids motion
  • PEPT
  • mixing
  • granulation


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