MR Imaging of Reynolds Dilatancy in the Bulk of Smooth Granular Flows
arXiv:0704.3745 · doi:10.1209/0295-5075/84/38001
Abstract
Dense granular matter has to expand in order to flow, a phenomenon known as dilatancy. Here we perform, by means of Magnetic Resonance Imaging, direct measurements of the evolution of the local packing density of a slow and smooth granular shear flow generated in a split-bottomed geometry. The dilatancy is found to be surprisingly strong. The dilated zone follow the region of large strain rate and slowly spreads as a function of time. This suggests that the local packing density is governed by the total amount of local strain experienced since the start of the experiment.
arXiv comment4 pages, 3 figs, submitted to PRE
References in corpus (12)
- On 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
- Three-dimensional shear in granular flow
- Shear band formation in granular media as a variational problem
- Stresses in Smooth Flows of Dense Granular Media
- Core Precession and Global Modes in Granular Bulk Flow
- Shear zones in granular media: 3D Contact Dynamics simulation
- Continuum approach to wide shear zones in quasi-static granular matter
- The Behavior of Granular Materials under Cyclic Shear
- Shear Zones in granular materials: Optimization in a self-organized random potential
Cited by in corpus (10)
- Granular materials composed of shape-anisotropic grains
- Effects of grain shape on packing and dilatancy of sheared granular materials
- Granular Flows in Split-Bottom Geometries
- Magnetic Resonance Imaging of Granular Materials
- Focus on Imaging Methods in Granular Physics
- Intermittency and Velocity Fluctuations in Hopper Flows Prone to Clogging
- Heaping, Secondary Flows and Broken Symmetry in Flows of Elongated Granular Particles
- Evolution of shear zones in granular materials
- Reflection and Exclusion of Shear Zones in Inhomogeneous Granular Materials
- Convective Flows in Sheared Packings of Spherical Particles