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Predicting Catalyst Extrudate Breakage Based on the Modulus of Rupture
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Emulsification in turbulent flow 2. Breakage rate constants.

Nina Vankova1, Slavka Tcholakova, Nikolai D Denkov

  • 1Laboratory of Chemical Physics & Engineering, Faculty of Chemistry, Sofia University, 1 James Bourchier Ave., 1164 Sofia, Bulgaria.

Journal of Colloid and Interface Science
|June 8, 2007
PubMed
Summary

This study quantifies factors influencing oil-water emulsion breakage in turbulent flow. Findings reveal breakage rate depends on drop size, interfacial tension, viscosity, and energy dissipation, crucial for emulsion stability.

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Published on: February 22, 2018

Area of Science:

  • Fluid Dynamics
  • Colloid and Surface Science
  • Chemical Engineering

Background:

  • Emulsification is vital in many industries, but controlling droplet size and stability remains challenging.
  • Understanding droplet breakage dynamics in turbulent flow is key to optimizing emulsification processes.

Purpose of the Study:

  • To systematically investigate the effects of key physical parameters on the breakage rate constant (kBR) during turbulent emulsification.
  • To compare experimental findings with existing theoretical models and propose a refined expression for kBR.

Main Methods:

  • Utilized monodisperse oil-in-water emulsions generated via membrane emulsification.
  • Employed a narrow-gap homogenizer operating in a turbulent regime to induce controlled droplet breakage.
  • Analyzed droplet number concentration evolution over time using a kinetic model.

Main Results:

  • The breakage rate constant (kBR) was found to be significantly influenced by drop size, interfacial tension, oil phase viscosity, and energy dissipation rate.
  • Experimental data were well-described by a model combining collision frequency with turbulent eddies and drop deformation energy.
  • Drop deformation energy comprises contributions from surface extension and internal viscous dissipation.

Conclusions:

  • Developed an explicit expression for kBR that accurately predicts experimental observations across various systems.
  • The findings provide a more robust understanding of droplet breakage mechanisms in turbulent flow.
  • This research offers valuable insights for designing and controlling industrial emulsification processes.