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.
Cheng
Xiang
X
The James Franck Institute and Department of Physics, The University of Chicago, Chicago, Illinois 60637, USA.
Lechman
Jeremy B
JB
Fernandez-Barbero
Antonio
A
Grest
Gary S
GS
Jaeger
Heinrich M
HM
Karczmar
Greg S
GS
Möbius
Matthias E
ME
Nagel
Sidney R
SR
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