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Convective motion in a vibrated granular layer.

A Garcimartín1, D Maza, J L Ilquimiche

  • 1Departamento de Física, Facultad de Ciencias, Universidad de Navarra, E-31080 Pamplona, Spain. angel@fisica.unav.es

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|March 23, 2002
PubMed
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Vertically shaken granular layers exhibit convective rolls at high accelerations. Grain velocity near the wall scales with acceleration and layer height, unifying experimental data.

Area of Science:

  • Physics
  • Fluid Dynamics
  • Materials Science

Background:

  • Granular materials exhibit complex behaviors when subjected to external forces.
  • Understanding the dynamics of shaken granular layers is crucial for various applications.

Purpose of the Study:

  • To investigate the convective motion in a vertically shaken granular layer.
  • To measure and analyze the velocity of grains near the wall.

Main Methods:

  • Experimental setup involving a vertically shaken granular layer.
  • Velocity measurements using particle tracking or similar techniques.
  • Data analysis involving rescaling of velocity, acceleration, and layer height.

Main Results:

  • Convective motion, in the form of rolls, emerges at frequencies around 110 Hz and accelerations exceeding gravity.

Related Experiment Videos

  • Grain velocity near the wall shows a linear increase with acceleration, followed by a saturation effect.
  • Rescaled velocity data collapses onto a single universal curve when normalized by wall velocity amplitude and granular layer height.

    • Conclusions:

    • Vertical shaking can induce complex convective patterns in granular layers.
    • The observed velocity scaling provides a universal description of grain dynamics near the wall.
    • This study offers insights into the fundamental physics of granular flow under vibration.