Title
Non-affine Response of Granular Packing and Dynamic Heterogeneities in Dense Granular Flows
Abstract
We study microscopic responses of two-dimensional granular packing to isotropic
compressions by numerical simulations, where we find that degree of non-affinity
is nicely scaled by the ratio of an increment of area fractions to distance from the
jamming point. Because of the non-affine response of granular packing, development
of probability distribution functions (PDFs) of inter-particle forces or overlaps is
characterized by “broadening” and we introduce Master equation to describe the
development of the PDFs under isotropic compressions.
In the second part of this talk, we show our experiments on dynamic heterogeneities
(DH) in dense granular flows, where we trace grains floating on capillary waves and
investigate typical time and length scales which diverge near the jamming point.
From our experiments, we find that the granular flows are significant for diffusion
but not for DH.
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