Journal article
A positron emission particle tracking investigation of the scaling law governing free surface flows in tumbling mills

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Publication Details
Author list: Govender I., Richter M., Mainza A., De Klerk D.
Publisher: Wiley
Publication year: 2017
Journal: AICHE Journal
Journal name: AIChE Journal
Volume number: 63
Issue number: 3
Start page: 903
End page: 913
Total number of pages: 11
ISSN: 0001-1541
eISSN: 1547-5905


Positron Emission Particle Tracking (PEPT) measurements are used to
track the flow of d = 5 glass beads within a rotating drum fitted with
(and without) lifter bars and operated in the cascading and cataracting
Froude regimes. After converting the Lagrangian trajectories of a
representative radio-labeled glass bead (the tracer) into Eulerian
fields under the ergodic assumption, the bed shape and kinematics are
extracted for steady, fully developed flow conditions. Notwithstanding
the azimuthal wall effects introduced by the lifter bars, we show a
linear scaling (Formula presented.) of the local flowing layer thickness
(h) with local depth-averaged velocity (Formula presented.) and a
constant average shear (Formula presented.) for direct measurements
spanning the entire flowing layer (not just the central region), and
high Froude regimes (cascading and cataracting) not previously
investigated by scaling analysis in the literature. © 2016 American
Institute of Chemical Engineers AIChE J, 63: 903–913, 2017.

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Last updated on 2017-30-10 at 16:57