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From jamming to fast compaction dynamics in granular binary mixtures.

Salvatore Pillitteri1, Geoffroy Lumay2, Eric Opsomer2

  • 1GRASP, Physics Department B5a, University of Liège, B-4000, Liège, Belgium. s.pillitteri@uliege.be.

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The compaction dynamics of binary granular mixtures are strongly dependent on particle size ratios. Researchers observed that grain mobility and compaction time diverge near a critical size ratio, impacting packing density.

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Area of Science:

  • Physics
  • Materials Science
  • Granular Mechanics

Background:

  • Binary granular mixtures exhibit diverse packing structures influenced by component fractions and size ratios.
  • While final packing fraction is geometrically predictable, the dynamic compaction process under vibration is complex.

Purpose of the Study:

  • To investigate the size ratio-dependent dynamics of binary granular mixture compaction under vibration.
  • To identify critical size ratios affecting grain mobility and compaction characteristic time.

Main Methods:

  • Experimental observation of granular pile compaction dynamics.
  • Analysis of how varying particle size ratios influences compaction behavior.

Main Results:

  • Compaction characteristic time diverges near a critical size ratio, indicating reduced grain mobility.
  • Lowest grain mobility occurs near the percolation threshold where small particles fill voids of large ones.
  • A fast compaction dynamics regime is observed for sufficiently large grain size ratios.

Conclusions:

  • The size ratio is a critical parameter governing the compaction dynamics of binary granular mixtures.
  • Understanding these dynamics is key to controlling granular material packing and behavior.