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

Massimo Pica Ciamarra¹, Mario Nicodemi, Antonio Coniglio

¹Dipartimento di Scienze Fisiche, Universitá di Napoli Federico II and INFM, Unitá di Napoli, 80126 Napoli, Italy. picaciam@na.infn.it

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics

|March 16, 2007

Summary

Granular media compaction via fluid pulses mimics glass dynamics, showing slow volume increase and diverging compaction time with lower intensity. Grain motion reveals similarities and differences to glass formers.

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Area of Science:

Physics
Materials Science
Complex Systems

Background:

Granular media compaction is crucial in various industrial processes.
Previous studies suggested analogies between granular compaction and glass-forming systems.

Purpose of the Study:

Investigate the compaction dynamics of granular media under fluid pulse tapping.
Explore similarities and differences between granular compaction and glass-forming dynamics.

Main Methods:

Molecular dynamics simulations were employed.
Analysis spanned macroscopic (volume fraction), mesoscopic (Voronoi volumes, force distributions), and microscopic (grain displacements) levels.

Main Results:

Compaction dynamics exhibit characteristics of slow glass dynamics, including stretched exponential volume fraction increase.
Compaction time diverges as tapping intensity decreases.
Microscopic analysis revealed dynamical heterogeneities and correlated grain motion, analogous to glass formers, but with distinct cage effects.

Conclusions:

Fluid pulse tapping induces compaction in granular media with behaviors similar to glass-forming systems.
Both macroscopic and microscopic analyses support the analogy, highlighting similarities in dynamics and correlations between grain geometry and motion.