Experimental Study of Granular Compaction Dynamics at Different Scales: Grain Mobility, Hexagonal Domains, and Packing Fraction

G. Lumay and N. Vandewalle
Experimental Study of Granular Compaction Dynamics at Different Scales: Grain Mobility, Hexagonal Domains, and Packing Fraction
Phys. Rev. Lett. 95, 028002, 2005
DOI: https://doi.org/10.1103/PhysRevLett.95.028002

Experimental Study of Granular Compaction Dynamics at Different Scales: Grain Mobility, Hexagonal Domains, and Packing Fraction

We present an original experimental study of the compaction dynamics for two-dimensional granular systems.
Compaction dynamics is measured at three different scales: the macroscopic scale through the normalized packing fraction ˜ρ,
the mesoscopic scale through the normalized fraction ˜ϕ of hexagonal domains in the system, and the microscopic scale through the grain mobility μ.

Moreover, the hexagonal domains are found to obey a growth process dominated by the displacement of domain boundaries.

A global picture of compaction dynamics relevant at each scale is proposed.