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Related Experiment Videos

Foam Destabilization by Mechanical and Ultrasonic Vibrations.

Morey1, Deshpande, Barigou

  • 1School of Chemical Engineering, The University of Birmingham, Birmingham, Edgbaston, B15 2TT, United Kingdom

Journal of Colloid and Interface Science
|October 21, 1999
PubMed
Summary

Mechanical and ultrasonic vibrations effectively break persistent foams. Vibrations offer a non-chemical, non-mechanical method for foam destruction in industrial applications by enhancing liquid drainage and film destabilization.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Physics of Soft Matter

Background:

  • Foam destabilization is critical in numerous industrial processes.
  • Conventional foam breaking methods include chemical additives and mechanical disruption.
  • Vibrations, known to influence soft solids, present a novel, noninvasive approach to foam control.

Purpose of the Study:

  • To experimentally investigate the efficacy of mechanical and ultrasonic vibrations for foam destruction.
  • To compare vibration-based methods with traditional chemical and mechanical techniques.
  • To understand the mechanisms underlying vibration-induced foam destabilization.

Main Methods:

  • Applying mechanical vibrations to static foams composed of non-Newtonian shear-thinning liquids.

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  • Utilizing high-intensity ultrasonic vibrations on both static and dynamic foams.
  • Analyzing changes in foam structure, liquid drainage, and film stability.

    • Main Results:

    • Mechanical vibrations effectively broke static foams by promoting liquid drainage and film rupture, linked to enhanced shear thinning.
    • Ultrasonic vibrations proved efficient in destabilizing static foams and controlling dynamic foam heads.
    • Foam film destabilization by ultrasound is potentially caused by squeezing mode surface wave phenomena.

    Conclusions:

    • Vibrational methods provide a viable, noninvasive alternative for industrial foam destruction.
    • Mechanical vibrations are suitable for static foam breakdown in non-Newtonian fluids.
    • Ultrasonic vibrations offer a versatile solution for both static and continuous dynamic foam control.