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Microfluidic step-emulsification in axisymmetric geometry.

I Chakraborty1, J Ricouvier, P Yazhgur

  • 1Department of Chemical Engineering, Technion-IIT, Haifa, 32000, Israel. lisha@technion.ac.il.

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Summary
This summary is machine-generated.

Axisymmetric step-emulsification models planar devices for high-throughput droplet generation. This simplified model allows for efficient simulation, revealing droplet size is primarily controlled by surface tension, not flow rates or viscosity.

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Materials Science

Background:

  • Biphasic step-emulsification is a microfluidic technique for producing monodisperse droplets.
  • Planar devices are complex for theoretical and numerical analysis.
  • High-throughput production of μm and sub-μm droplets is essential for various applications.

Purpose of the Study:

  • To investigate a simplified axisymmetric model of step-emulsification.
  • To enable computationally inexpensive numerical simulations of droplet generation.
  • To understand the hydrodynamics and droplet formation regimes.

Main Methods:

  • Developed an axisymmetric model simulating core-annular flow in expanding tubes.
  • Performed 2D numerical simulations of biphasic flow.
  • Conducted a parametric study varying dimensionless parameters.
  • Validated numerical predictions with in-house experiments.

Main Results:

  • The axisymmetric model replicates droplet generation regimes of planar devices.
  • A phase diagram for droplet generation regimes was established.
  • Droplet size is independent of capillary number and viscosity ratio.
  • Surface tension is the dominant factor controlling droplet size.

Conclusions:

  • Axisymmetric step-emulsification is a valid and efficient model for planar devices.
  • Simplified simulations provide accurate insights into droplet formation.
  • The findings confirm the surface tension-dominated nature of the step-emulsification regime.