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Area of Science:

  • Physics
  • Complex Systems
  • Materials Science

Background:

  • Granular mixtures with varying particle sizes show complex segregation and condensation patterns.
  • Observing the internal structure's time evolution is key to understanding segregation dynamics but remains challenging.

Purpose of the Study:

  • To investigate the dynamics of segregation in fluidized granular mixtures.
  • To reveal the interplay between segregation, surface flow, and hysteresis in granular fluidity.
  • To model the observed complex band dynamics in granular systems.

Main Methods:

  • Experiments conducted in a quasi-2D container with horizontal agitation.
  • Direct observation of surface flow and internal structural evolution.
  • Development of Bonhoeffer-van der Pol type equations based on experimental data.

Main Results:

  • Discovery of self-replicating bands in granular mixtures under agitation.
  • Identification of a crucial coupling between segregation, surface flow, and hysteresis.
  • Successful reproduction of complex band dynamics (replication, oscillation, breathing) using developed equations.

Conclusions:

  • Granular segregation dynamics are governed by the coupled effects of segregation, surface flow, and hysteresis.
  • The observed pattern formation in granular segregation shares similarities with reaction-diffusion systems.
  • The developed model accurately captures the complex dynamics of granular band formation.