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Interstitial gas effect on vibrated granular columns.

Javier C Pastenes1, Jean-Christophe Géminard2, Francisco Melo1

  • 1Departamento de Física Universidad de Santiago de Chile, Avenida Ecuador 3493, 9170124 Estación Central, Santiago, Chile.

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

Heavy grains bouncing on an oscillating surface exhibit behaviors similar to a porous solid, even with dilation. This is due to a slight delay in grain takeoff times, impacting granular material dynamics.

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Area of Science:

  • Physics
  • Materials Science

Background:

  • Vibrated granular materials are crucial for studying particle segregation, convection, and heaping.
  • Understanding granular material dynamics under external forces is essential in various scientific and engineering fields.

Purpose of the Study:

  • To investigate the behavior of a column of heavy grains bouncing on an oscillating solid surface.
  • To analyze the pressure variations and dynamics of the granular column under specific conditions.

Main Methods:

  • Experimental setup involving a column of heavy grains on an oscillating solid surface.
  • Measurement of temporal pressure variations at the base of the column.
  • Direct observation of the column's dynamics, including grain movement and dilation.

Main Results:

  • For weak interstitial gas effects, pressure variations are consistent with the column acting as a porous solid, despite observed dilation.
  • Direct observations reveal upper and lower surface grains are in free fall.
  • Column dilation is attributed to a minor delay in grain takeoff times.

Conclusions:

  • A bouncing granular column, under specific conditions, can be modeled as a porous solid.
  • Grain takeoff time delays are a key factor in granular column dilation and dynamics.
  • The study provides insights into the complex behavior of vibrated granular materials.