Experimental study of the compaction dynamics for 2D anisotropic granular materials

Abstract

We present an experimental study of the compaction dynamics for two-dimensional anisotropic granular systems. Compaction dynamics is measured at three different scales : (i) the macroscopic scale through the packing fraction $\rho$, (ii) the mesoscopic scale through both fractions of aligned grains ${\varphi }_a$ and ideally ordered grains ${\varphi }_{io}$, and (iii) the microscopic scale through both rotational and translational grain mobilities ${\mu }_{r,t}$. The effect of the grain rotations on the compaction dynamics has been measured. At the macroscopic scale, we have observed a discontinuity in the late stages of the compaction curve. At the mesoscopic scale, we have observed the formation and the growth of domains made of aligned grains. From a microscopic point of view, measurements reveal that the beginning of the compaction process is essentially related to translational motion of the grains. The grains rotations drive mainly the process during the latest stages of compaction.

8pages, 11 figures

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Cited by in corpus (6)

• Granular materials composed of shape-anisotropic grains
• Column collapse of granular rods
• The role of tap duration for the steady state density of vibrated granular media
• Steady state of tapped granular polygons
• Angular velocity distribution of a granular planar rotator in a thermalized bath
• Invited review: Effect of temperature on a granular pile