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Related Experiment Video

Updated: Dec 25, 2025

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Ultrasonic backscattering and microstructure in sheared concentrated suspensions.

Olivier Lombard1, Julien Rouyer1, Eric Debieu1

  • 1Aix-Marseille Univeristy, CNRS, Centrale Marseille, LMA UMR 7031, Marseille, France.

The Journal of the Acoustical Society of America
|April 3, 2020
PubMed
Summary

Shear-induced anisotropic microstructures in concentrated suspensions alter ultrasonic backscattering. This study quantifies these changes using quantitative ultrasound and numerical simulations, revealing microstructure

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Area of Science:

  • Physics
  • Materials Science
  • Acoustics

Background:

  • Quantitative ultrasound techniques, utilizing the backscatter coefficient (BSC), characterize concentrated particle suspensions by fitting scattering models to measured BSC.
  • Standard models assume isotropic scatterer microstructure, but sheared suspensions can exhibit anisotropic microstructures, influencing ultrasonic properties.
  • Understanding the impact of anisotropic microstructures on ultrasonic backscattering is crucial for accurate suspension characterization.

Purpose of the Study:

  • To investigate the influence of shear-induced anisotropic microstructures in concentrated suspensions on ultrasonic backscattering.
  • To compare experimental findings with numerical simulations to validate the role of microstructure in ultrasonic scattering.

Main Methods:

  • Experiments were performed on polymethylmetacrylate sphere suspensions (5.8 μm radius) subjected to Couette flow to induce anisotropy, and manual mixing for isotropy.
  • Quantitative ultrasound measured the backscatter coefficient (BSC) for both isotropic and anisotropic suspensions.
  • Stokesian dynamics simulations were employed to determine the pair correlation function and compare with experimental structure factors derived from BSC measurements.

Main Results:

  • Experimental structure factors, derived from BSC measurements of concentrated and diluted suspensions, showed good agreement with Stokesian dynamics simulations.
  • Numerical simulations confirmed that shear-induced anisotropic microstructures lead to angular-dependent backscatter coefficients and structure factors.
  • The study successfully linked ultrasonic backscattering properties to the anisotropic microstructure of sheared concentrated suspensions.

Conclusions:

  • Shear-induced anisotropy in concentrated suspensions significantly affects ultrasonic backscattering.
  • Quantitative ultrasound, combined with numerical simulations, provides a robust method for probing and understanding microstructure-dependent acoustic properties.
  • The findings highlight the importance of considering microstructural anisotropy in the application of ultrasound for characterizing complex fluids.