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Sound waves, which are longitudinal waves, can be modeled as the displacement amplitude varying as a function of the spatial and temporal coordinates. As a column of the medium is displaced, its successive columns are also displaced. As the successive displacements differ relatively, a pressure difference with the surrounding pressure is created. The gauge pressure varies across the medium.
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Probing density waves in fluidized granular media with diffusing-wave spectroscopy.

Philip Born1, Steffen Reinhold1, Matthias Sperl1

  • 1Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt, 51170 Köln, Germany.

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|October 15, 2016
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Summary
This summary is machine-generated.

Density waves in fluidized beds complicate measurements. A new model for diffusing-wave spectroscopy accounts for these waves, enabling better characterization of particle motion and bed heterogeneities.

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Area of Science:

  • Physics
  • Chemical Engineering
  • Materials Science

Background:

  • Fluidized beds exhibit characteristic density waves.
  • These waves impact measurements of liquid-like dynamics in granular media.
  • Diffusing-wave spectroscopy (DWS) is a technique sensitive to particle dynamics.

Purpose of the Study:

  • To derive the intensity autocorrelation function for DWS in the presence of density waves.
  • To enable accurate characterization of microscopic particle motions in fluidized granular media.
  • To identify and quantify heterogeneities within fluidized beds.

Main Methods:

  • Theoretical derivation of the intensity autocorrelation function.
  • Modeling DWS signal in the presence of density waves.
  • Experimental validation using a gas-fluidized bed.

Main Results:

  • The derived model accurately predicts experimental observations of the intensity autocorrelation function.
  • The model demonstrates the separability of density wave contributions from particle motion.
  • Successful characterization of microscopic scatterer displacement was achieved.

Conclusions:

  • The developed model enhances DWS applicability to fluidized granular systems.
  • It allows for the distinct analysis of density waves and particle dynamics.
  • This facilitates advanced characterization of fluidized bed properties and heterogeneities.