Stresses in Smooth Flows of Dense Granular Media
arXiv:cond-mat/0611080 · doi:10.1209/0295-5075/78/58001
Abstract
The form of the stress tensor is investigated in smooth, dense granular flows which are generated in split-bottom shear geometries. We find that, within a fluctuation fluidized spatial region, the form of the stress tensor is directly dictated by the flow field: The stress and strain-rate tensors are co-linear. The effective friction, defined as the ratio between shear and normal stresses acting on a shearing plane, is found not to be constant but to vary throughout the flowing zone. This variation can not be explained by inertial effects, but appears to be set by the local geometry of the flow field. This is in agreement with a recent prediction, but in contrast with most models for slow grain flows, and points to there being a subtle mechanism that selects the flow profiles.
arXiv comment5 pages, 4 figures
References in corpus (13)
- On dense granular flows
- A constitutive law for dense granular flows
- Granular flow down an inclined plane: Bagnold scaling and rheology
- Signatures of granular microstructure in dense shear flows
- Universal and wide shear zones in granular bulk flow
- Continuum description of avalanches in granular media
- Three-dimensional shear in granular flow
- Force indeterminacy in the jammed state of hard disks
- Core Precession and Global Modes in Granular Bulk Flow
- A Hydrodynamic model for a dynamical jammed-to-flowing transition in gravity driven granular media
- Continuum approach to wide shear zones in quasi-static granular matter
- Dynamics of Random Packings in Granular Flow
- Shear Zones in granular materials: Optimization in a self-organized random potential
Cited by in corpus (19)
- Jamming, Yielding and Rheology of Weakly Vibrated Granular Media
- Flow-induced Agitations Create a Granular Fluid
- Rheological properties of dense granular flows
- Continuum modeling of mechanically-induced creep in dense granular materials
- Shear zones in granular media: 3D Contact Dynamics simulation
- Granular Flows in Split-Bottom Geometries
- Rheology of dense granular flows for elongated particles
- MR Imaging of Reynolds Dilatancy in the Bulk of Smooth Granular Flows
- General scaling relations for locomotion in granular media
- From Frictional to Viscous Behavior: Three Dimensional Imaging and Rheology of Gravitational Suspensions
- Relevance of visco-plastic theory in a multi-directional inhomogeneous granular flow
- Flow-Arrest Transitions in Frictional Granular Matter
- Rheology of Weakly Vibrated Granular Media
- Viscometric flow of dense granular materials under controlled pressure and shear stress
- Evolution of shear zones in granular materials
- Shear Is Not Always Simple: Rate-Dependent Effects of Flow Type on Granular Rheology
- Reflection and Exclusion of Shear Zones in Inhomogeneous Granular Materials
- Wide shear zones and the spot model: Implications from the split-bottom geometry
- Finite width of quasi-static shear bands