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Related Experiment Videos

A comparative study between classical stirred and ultrasonically-assisted dead-end ultrafiltration.

A Simon1, L Penpenic, N Gondrexon

  • 1ENSCR, Laboratoire de Chimie des Eaux et de l'Environnement, Rennes, France. aelain@yahoo.com

Ultrasonics Sonochemistry
|November 4, 2000
PubMed
Summary

Ultrasonic assistance enhances mass transfer coefficients in dead-end ultrafiltration. An empirical model correlates these coefficients with ultrasonic power, improving efficiency by managing concentration polarization.

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Area of Science:

  • Chemical Engineering
  • Separation Processes
  • Fluid Dynamics

Background:

  • Classical stirred dead-end ultrafiltration faces limitations in mass transfer efficiency.
  • Concentration polarization significantly hinders ultrafiltration performance.
  • Understanding hydrodynamics is crucial for optimizing filtration processes.

Purpose of the Study:

  • To determine and compare mass transfer coefficients in ultrasonically-assisted and classical stirred dead-end ultrafiltration.
  • To develop an empirical model for mass transfer coefficients under ultrasonic conditions.
  • To investigate the impact of ultrasonic waves on hydrodynamics and concentration polarization.

Main Methods:

  • Comparative study of ultrasonically-assisted and classical stirred dead-end ultrafiltration.

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  • Determination of mass transfer coefficients.
  • Development of an empirical model based on ultrasonic power and hydrodynamic effects.
  • Analysis of cavitation and convective currents induced by ultrasound.

    • Main Results:

    • Ultrasonic assistance significantly improves mass transfer coefficients compared to classical methods.
    • An empirical model successfully describes mass transfer coefficients under ultrasonic conditions, with ultrasonic power as a key parameter.
    • Ultrasound-induced agitation, through convective currents and cavitation, effectively mitigates concentration polarization.
    • Hydrodynamics are demonstrably influenced by the intensity of ultrasonic effects.

    Conclusions:

    • Ultrasonically-assisted dead-end ultrafiltration offers superior mass transfer performance.
    • The developed empirical model provides a valuable tool for predicting and optimizing filtration under ultrasonic conditions.
    • Ultrasound effectively enhances separation efficiency by influencing fluid dynamics and reducing concentration polarization.