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Microfluidic Droplet-Generation Device with Flexible Walls.

Sajad Yazdanparast1, Pouya Rezai1, Alidad Amirfazli1

  • 1Department of Mechanical Engineering, York University, Toronto, ON M3J 1P3, Canada.

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|September 28, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a flexible microfluidic device for precise droplet size control. This innovation enables a wider range of droplet sizes from a single apparatus, advancing applications in drug discovery and manufacturing.

Keywords:
co-flow methoddroplet-size controlflexible wallsmicrofluidics droplet generation

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Biomedical Engineering

Background:

  • Precise control of droplet size is critical for biomedical research, drug discovery, high-throughput screening, and emulsion manufacturing.
  • Current droplet generation devices often have limited ranges of droplet sizes and require multiple setups.

Purpose of the Study:

  • To develop a single co-flow microfluidic device with adjustable channel width for flexible droplet size control.
  • To investigate the impact of channel width on droplet generation regimes and sizes.

Main Methods:

  • A co-flow microfluidic device with adjustable flexible walls was designed and fabricated.
  • The continuous (C)-phase channel width was varied to modulate flow velocity and viscous forces.
  • Droplet generation regimes (dripping and plug) were observed, and droplet sizes were measured across different channel widths and flow conditions.

Main Results:

  • Adjusting the channel width allowed for on-demand modulation of droplet sizes within a single device.
  • Two regimes, dripping and plug, were identified based on channel width and low dispersed (D)-phase Weber numbers.
  • Reducing channel width, particularly at a constant C-phase flow rate, resulted in smaller droplets due to wall effects and increased C-phase velocity.
  • A droplet size range of 175–913 µm was achieved, significantly wider than existing single-device capabilities.

Conclusions:

  • The developed microfluidic device offers a versatile platform for generating a broad spectrum of droplet sizes.
  • An empirical model based on Buckingham's Pi theorem was established to predict droplet size, incorporating channel dimensions and flow parameters.