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Granular flow fields in vertical high shear mixer granulators
Author(s) -
Ng B. H.,
Kwan C. C.,
Ding Y. L.,
Ghadiri M.,
Fan X. F.,
Parker D. J.
Publication year - 2008
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.11389
Subject(s) - mechanics , conical surface , particle (ecology) , materials science , particle density , mixing (physics) , frustum , dispersion (optics) , flow (mathematics) , granular material , composite material , physics , engineering , optics , mechanical engineering , thermodynamics , geology , oceanography , quantum mechanics , volume (thermodynamics)
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 μm) and shape as quantified by the angle of internal friction (26° and 38°) 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 1 and 5 L capacity and both machines have similar mixing and dispersion with constant tip speed criterion. © 2007 American Institute of Chemical Engineers AIChE J, 2008