Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2006-04-19
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
The flow of dry granular material in a half-filled rotating drum is studied. The thickness of the flowing zone is measured for several rotation speeds, drum sizes and beads sizes (size ratio between drum and beads ranging from 47 to 7400). Varying the rotation speed, a scaling law linking mean velocity vs thickness of the flow, $v\sim h^m$, is deduced for each couple (beads, drum). The obtained exponent $m$ is not always equal to 1, value previously reported in a drum, but varies with the geometry of the system. For small size ratios, exponents higher than 1 are obtained due to a saturation of the flowing zone thickness. The exponent of the power law decreases with the size ratio, leading to exponents lower than 1 for high size ratios. These exponents imply that the velocity gradient of a dry granular flow in a rotating drum is not constant. More fundamentally, these results show that the flow of a granular material in a rotating drum is very sensible to the geometry, and that the deduction of the ``rheology'' of a granular medium flowing in such a geometry is not obvious.
D'Ortona Umberto
Falk Véronique
Félix Gwenaëlle
No associations
LandOfFree
Granular Flows in a Rotating Drum: the Scaling Law between Velocity and Thickness of the Flow does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Granular Flows in a Rotating Drum: the Scaling Law between Velocity and Thickness of the Flow, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Granular Flows in a Rotating Drum: the Scaling Law between Velocity and Thickness of the Flow will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-67301