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An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
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Published on: December 4, 2017

Dynamic effective mass of granular media.

Chaur-Jian Hsu1, David L Johnson, Rohit A Ingale

  • 1Schlumberger-Doll Research, One Hampshire Street, Cambridge, Massachusetts 02139, USA.

Physical Review Letters
|March 5, 2009
PubMed
Summary
This summary is machine-generated.

We introduce frequency-dependent effective mass for granular materials, revealing insights into acoustic dissipation, elasticity, and aging. Humidity significantly impacts acoustic wave attenuation by influencing capillary condensation kinetics.

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Area of Science:

  • Physics
  • Materials Science
  • Acoustics

Background:

  • Granular materials exhibit complex mechanical behaviors influenced by inter-particle interactions.
  • Understanding acoustic wave propagation in granular media is crucial for various applications.
  • Capillary forces can play a significant role in the behavior of granular materials under varying humidity.

Purpose of the Study:

  • To develop and investigate the concept of frequency-dependent effective mass (M(ω)) in jammed granular materials.
  • To identify how M(ω) signatures relate to dissipation, elasticity, and aging in granular systems.
  • To explore the influence of humidity on acoustic properties and the underlying mechanisms.

Main Methods:

  • Experimental setup with granular materials in a rigid cavity at 48% filling fraction.
  • Humidity-controlled experiments to assess environmental effects.
  • Interpretation using a continuum model and a "trap" model for capillary bridges.
  • Analysis of frequency-dependent effective mass (M(ω)).

Main Results:

  • Dominant features of M(ω) reveal signatures of acoustic mode dissipation, elasticity, and aging.
  • Humidity significantly affects the mechanical response of the granular material.
  • Experimental data is consistent with models involving thermally activated capillary bridges.

Conclusions:

  • The frequency-dependent effective mass is a valuable concept for characterizing granular materials.
  • Acoustic wave attenuation in granular materials is strongly influenced by capillary condensation kinetics.
  • The study highlights the importance of considering humidity and inter-particle forces in granular acoustics.