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Controlled Viscosity in Dense Granular Materials.

A Gnoli1,2, L de Arcangelis3, F Giacco4

  • 1Institute for Complex Systems-CNR, Piazzale Aldo Moro 2, 00185 Rome, Italy.

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|April 26, 2018
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Summary
This summary is machine-generated.

Mechanical vibrations can fluidize granular materials, causing a jammed system to transition into a fluidized state and then back to a frictional state. This reentrant transition depends on material properties and forces within the system.

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Area of Science:

  • Physics
  • Materials Science
  • Rheology

Background:

  • Granular materials exhibit complex behaviors under external stimuli.
  • Understanding the transition from jammed to fluidized states is crucial for various applications.

Purpose of the Study:

  • To experimentally investigate the fluidization of granular materials using mechanical vibrations.
  • To analyze the reentrant transition observed in granular systems.
  • To understand the material dependence of viscosity recovery.

Main Methods:

  • Experimental setup involving a vibrating granular medium and a motor-driven vane.
  • Monitoring the angular velocity of the vane to assess material state.
  • Conducting molecular dynamics simulations to model the system.

Main Results:

  • Observed a reentrant transition from jammed to fluidized and back to frictional states with increasing vibration frequency.
  • Fluidization frequency was found to be independent of material properties.
  • Viscosity recovery frequency demonstrated a clear dependence on the material.

Conclusions:

  • The reentrant transition is a key characteristic of vibrated granular materials.
  • Material-dependent viscosity recovery is linked to the balance of dissipative and inertial forces.
  • Molecular dynamics simulations successfully validated the experimental findings and theoretical model.