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Microstructure evolution in density relaxation by tapping.

Anthony D Rosato¹, Oleksandr Dybenko, David J Horntrop

¹Granular Science Laboratory, Department of Mechanical and Industrial Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, USA.

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

|September 28, 2010

Summary

Density relaxation in granular materials is studied. A critical tap intensity maximizes bulk solids fraction by creating an upward-propagating ordered packing structure.

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Area of Science:

Physics
Materials Science
Chemical Engineering

Background:

Granular materials exhibit complex behaviors under external stimuli.
Understanding density relaxation is crucial for material processing and storage.

Purpose of the Study:

To model the density relaxation phenomenon in granular materials.
To investigate the impact of regular tapping on bulk solids fraction.

Main Methods:

Utilized Monte Carlo simulations.
Employed discrete element simulations.
Used monodisperse spheres in a planar-floored vessel.

Main Results:

Identified a critical tap intensity for maximum bulk solids fraction.
Observed an evolving ordered packing structure.
Demonstrated upward propagation of this structure from the floor.

Conclusions:

Tapping intensity significantly influences granular packing density.
Ordered structure formation is the key mechanism for density relaxation.
The findings provide insights into granular material dynamics.