Three-dimensional shear in granular flow.
The evolution of granular shear flow is investigated as a function of height in a split-bottom Couette cell. Using particle tracking, magnetic-resonance imaging, and large-scale simulations, we find a transition in the nature of the shear as a characteristic height H* is exceeded. Below H* there is a central stationary core; above H* we observe the onset of additional axial shear associated with torsional failure. Radial and axial shear profiles are qualitatively different: the radial extent is wide and increases with height, while the axial width remains narrow and fixed.
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.
Xiang
X
Cheng
Jeremy B
JB
Lechman
Antonio
A
Fernandez-Barbero
Gary S
GS
Grest
Heinrich M
HM
Jaeger
Greg S
GS
Karczmar
Matthias E
ME
Möbius
Sidney R
SR
Nagel
D003102:Colloids / Q000032:analysis* / Q000737:chemistry*; D003198:Computer Simulation; D044085:Microfluidics / Q000379:methods*; D008956:Models, Chemical; D009038:Motion; D010316:Particle Size; D033081:Shear Strength; D013314:Stress, Mechanical
D003102:Colloids