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Particle characterisation in highly concentrated dispersions using ultrasonic backscattering method.

Robert Weser1, Sebastian Wöckel, Benno Wessely

  • 1Technische Universität Dresden, Institut für Verfahrenstechnik und Umwelttechnik, 01062 Dresden, Germany. robert.weser@tu-dresden.de

Ultrasonics
|December 6, 2012
PubMed
Summary

This study presents an ultrasonic reflection method for measuring particle size and concentration in concentrated dispersions. The technique overcomes limitations of traditional methods, enabling inline particle characterization.

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Area of Science:

  • Physics
  • Materials Science
  • Chemical Engineering

Background:

  • Accurate particle size and concentration determination in concentrated dispersions is crucial for industrial processes but challenging with conventional methods.
  • Optical techniques struggle with opaque, highly concentrated samples, while established ultrasonic attenuation spectroscopy has inline limitations due to potential clogging.
  • Ultrasound offers a non-invasive approach for characterizing opaque dispersions, as sound waves can penetrate them.

Purpose of the Study:

  • To develop and validate an ultrasonic reflection method for determining particle size and concentration in highly concentrated suspensions and emulsions.
  • To overcome the inline measurement limitations of traditional ultrasonic attenuation spectroscopy.
  • To provide a semi-empirical model for interpreting backscattering signals for particle characterization.

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Main Methods:

  • Utilized an ultrasonic reflection setup to measure sound waves backscattered by dispersions.
  • Statistically analyzed the backscattering signal to derive sound attenuation and scattering intensity.
  • Applied a semi-empirical approach based on single scattering theory to interpret measurement results.

Main Results:

  • Demonstrated that both sound attenuation and scattering intensity are sensitive to particle size and concentration.
  • Achieved good agreement between experimental measurements and theoretical predictions for glass beads in water dispersions.
  • Validated the method for dimensionless wave numbers between 0.1

Conclusions:

  • The developed ultrasonic reflection method is effective for particle characterization in highly concentrated dispersions under process conditions.
  • This technique offers a viable alternative to traditional methods, overcoming limitations associated with inline measurements.
  • The semi-empirical model provides a robust framework for interpreting ultrasonic backscattering data for particle size and concentration analysis.