NDLI: Velocity depth profile of granular matter in a horizontal rotating drum

Content Provider	Springer Nature Link
Author	Sanfratello, Lori Caprihan, Arvind Fukushima, Eiichi
Copyright Year	2006
Abstract	Using MRI velocimetry, we verify that the velocity depth profile of the flowing layer near the axial center of a half-filled 3D drum has the form V m[1 − (r/r 0)2]-Ω r, where r is the depth measured from the cylinder center, except very close to the free surface where it lies below the quadratic form. We confirm that this deviation is due in part to particles reaching the surface with large components of their velocity in the azimuthal direction. We used a 3D cylinder with a radial “paddle” placed at approximately the dynamic angle of repose, covering the top third of the flow, so as to null any azimuthal velocity. It was found that the deviation from the quadratic form was reduced by the presence of the paddle when the comparison is made at the same solid body rotation rate, at the same free surface velocity, and with the paddle placed at different positions, so long as it makes good contact with the surface. Thus, we conclude that a quadratic velocity depth profile may be a fundamental property of granular shear flows in this geometry, when the sole effect of the cylinder rotation is to transport the particles from the end of the flow to the beginning without imparting velocity perpendicular to the flow.
Starting Page	1
Ending Page	6
Page Count	6
File Format	PDF
ISSN	14345021
Journal	Granular Matter
Volume Number	9
Issue Number	1-2
e-ISSN	14347636
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-07-26
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Granular flow 3D drum flow Velocity profile MRI Engineering Thermodynamics, Transport Phenomena Industrial Chemistry/Chemical Engineering Structural Foundations, Hydraulic Engineering Engineering Fluid Dynamics Granular Media
Content Type	Text
Resource Type	Article
Subject	Physics and Astronomy Mechanics of Materials Materials Science

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