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Fabrication of the Thermoplastic Microfluidic Channels
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Inertial manipulation of bubbles in rectangular microfluidic channels.

Pooria Hadikhani1, S Mohammad H Hashemi, Gioele Balestra

  • 1Optics Laboratory, School of Engineering, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015, Lausanne, Switzerland. Demetri.Psaltis@epfl.ch.

Lab on a Chip
|March 8, 2018
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Summary
This summary is machine-generated.

Researchers controlled bubble trajectories in microchannels by adjusting forces. Bubble position depends on flow (Reynolds number) and surface tension (Capillary number), differing from solid particle behavior.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Multiphase flow

Background:

  • Inertial microfluidics research often focuses on rigid particles.
  • Deformable entities like bubbles are crucial in multiphase microflows but less studied.
  • Understanding bubble behavior is key for microfluidic applications.

Purpose of the Study:

  • To investigate and control the trajectory of bubbles in microchannels.
  • To analyze the lateral equilibrium position of bubbles based on fluid forces.
  • To compare bubble behavior with that of solid particles in microfluidic systems.

Main Methods:

  • Utilized a T-junction to introduce bubbles into rectangular and square microchannels.
  • Analyzed bubble equilibrium positions across a range of Reynolds (1 < Re < 40) and Capillary numbers (0.1 < Ca < 1).
  • Employed experimental observations validated by numerical simulations.

Main Results:

  • Bubble trajectory is controllable by balancing forces, influenced by Reynolds number, Capillary number, bubble diameter, and channel aspect ratio.
  • High Reynolds numbers drive bubbles towards walls; high Capillary numbers or larger diameters move them to the center.
  • Bubbles in shallow channels (aspect ratio > 1) migrate towards narrower sidewalls.

Conclusions:

  • Bubble equilibrium positions in rectangular channels differ significantly from those of solid particles.
  • Findings offer insights into bubble dynamics in laminar flows.
  • Results can inform the design of flow-based multiphase flow reactors.