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A microfluidic method to study demulsification kinetics.

Thomas Krebs1, Karin Schroen, Remko Boom

  • 1Institute for Sustainable Process Technology, Amersfoort, The Netherlands. thomas.krebs@wur.nl

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Summary
This summary is machine-generated.

This study quantifies droplet coalescence in emulsions using microfluidics. Coalescence time depends on droplet velocity and size, not concentration, offering insights into emulsion stability.

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Area of Science:

  • Fluid dynamics
  • Colloid and surface science

Background:

  • Emulsion stability is crucial for industrial applications.
  • Understanding droplet coalescence dynamics is key to controlling emulsion properties.

Purpose of the Study:

  • To investigate droplet coalescence in dense emulsions using microfluidic devices.
  • To quantify the relationship between coalescence rate, droplet velocity, and concentration.

Main Methods:

  • Microfluidic circuits were used for direct observation of oil-in-water emulsion droplet collisions.
  • High-speed imaging and trajectory analysis were employed to measure coalescence times.
  • Coalescence time distributions were calculated based on droplet velocity, dispersed phase fraction, and droplet pair diameter.

Main Results:

  • The expected coalescence time E(t(c)) scales with droplet approach velocity (v(0)) and droplet pair hydraulic diameter (d(p)).
  • Specifically, E(t(c)) is proportional to (v(0))(-0.105±0.043) and (d(p))(0.562±0.287).
  • Coalescence time was found to be independent of the dispersed phase fraction (φ).

Conclusions:

  • The study provides a quantitative model for droplet coalescence in emulsions.
  • The findings have implications for predicting and enhancing emulsion stability in industrial processes.
  • Microfluidics offers a powerful platform for studying fundamental emulsion behavior.