Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities

Details Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities

2007-02-28

arxiv.org/abs/cond-mat/0702675v1

Phys. Rev. E 75, 021303 (2007)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

The compaction dynamics of a granular media subject to a sequence of vertical taps made of fluid pulses is investigated via Molecular Dynamics simulations. Our study focuses on three different levels: macroscopic (volume fraction), mesoscopic (Vorono\"{\i} volumes, force distributions) and microscopic (grain displacements). We show that the compaction process has many characteristics which are reminiscent of the slow dynamics of glass forming systems, as previously suggested. For instance the mean volume fraction slowly increases in time and approaches a stationary value following a stretched exponential law, and the associated compaction time diverges as the tapping intensity decreases. The study of microscopic quantities also put in evidence the existence of analogies with the dynamics of glass formers, as the existence of dynamical heterogeneities and spatially correlated motion of grains; however it also shows that there are important qualitative differences, as for instance in the role of the cage effect. Correlations between geometry and dynamics of the system at the grain level are put in evidence by comparing a particle Vorono\"{\i} volume and its displacement in a single tap.

Affiliated with

Also associated with

No associations

Rating

Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Granular packs under vertical tapping: structure evolution, grain motion, and dynamical heterogeneities will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-524464