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Segregation transitions in wet granular matter

Samadani1, Kudrolli

  • 1Department of Physics, Clark University, Worcester, Massachusetts 01610, USA.

Physical Review Letters
|December 2, 2000
PubMed
Summary

Adding interstitial fluid to granular materials significantly reduces particle segregation and alters flow properties. Even small fluid amounts impact segregation and angle of repose, with full immersion potentially reversing segregation.

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Area of Science:

  • Granular physics
  • Fluid dynamics
  • Particle science

Background:

  • Particle segregation in granular materials is a complex phenomenon.
  • The role of interstitial fluids in granular flow is not fully understood.
  • Capillary forces are known to influence granular behavior.

Purpose of the Study:

  • To investigate the effect of interstitial fluid on particle segregation in a granular silo.
  • To quantify the impact of fluid volume fraction on segregation extent and angle of repose.
  • To explore the influence of viscous and capillary forces.

Main Methods:

  • Imaging bidisperse, color-coded particles poured into a silo.
  • Systematically varying the fluid volume fraction (V(f)).
  • Analyzing particle segregation (s) and angle of repose (θ).

Main Results:

  • Adding a small V(f) sharply reduces segregation and causes preferential clumping of small particles.
  • Both segregation (s) and angle of repose (θ) show a sharp initial change followed by saturation with increasing V(f).
  • Complete particle immersion in low-viscosity fluids can lead to a return of segregation.

Conclusions:

  • Interstitial fluid significantly modifies granular segregation and flow dynamics.
  • Viscous and capillary forces play crucial roles, especially at low fluid fractions.
  • Fluid properties and immersion levels dictate the extent of segregation and flow behavior.

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