MR Imaging of Reynolds Dilatancy in the Bulk of Smooth Granular Flows
Soft Condensed Matter
2009-11-13 v1 Materials Science
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.
Cite
@article{arxiv.0704.3745,
title = {MR Imaging of Reynolds Dilatancy in the Bulk of Smooth Granular Flows},
author = {Ken Sakaie and Denis Fenistein and Timothy J. Carroll and Martin van Hecke and Paul Umbanhowar},
journal= {arXiv preprint arXiv:0704.3745},
year = {2009}
}
Comments
4 pages, 3 figs, submitted to PRE