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Bubble Dislodgment in a Capillary Network with Microscopic Multichannels and Multibifurcation Features.

Cong Chao1, Xiaoqiang Jin1, Lijun Teng2

  • 1Institute for Materials and Processes, School of Engineering , The University of Edinburgh , The King's Buildings, Robert Stevenson Road , Edinburgh EH9 3FB , U.K.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 6, 2019
PubMed
Summary
This summary is machine-generated.

Network complexity significantly impacts bubble dislodgment pressure in microscopic channels. Bubble dislodgment pressure increases with network complexity and is dependent on bubble length, especially for shorter bubbles.

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Area of Science:

  • Fluid dynamics
  • Microfluidics
  • Porous media flow

Background:

  • Bubble lodgment in complex capillary networks is prevalent in industrial and biological systems.
  • Existing research on bubble dislodgment is limited to single channels, neglecting network complexity.
  • Precise control of bubble flows in porous media requires understanding dislodgment factors.

Purpose of the Study:

  • To investigate the pressure required to dislodge single bubbles from microscopic capillary networks.
  • To identify factors influencing dislodging pressure, including network structure, channel dimensions, and bubble length.
  • To develop a model for predicting bubble dislodgment in complex capillary networks.

Main Methods:

  • Designed a capillary network with multibifurcation and smoothly changing diameter, mimicking physiological vascular networks.
  • Conducted over 600 bubble dislodgment experiments.
  • Analyzed the effects of network structure, channel dimensions, and bubble length on dislodging pressure.

Main Results:

  • Network complexity is a dominant factor, increasing dislodging pressure.
  • Bubble length affects dislodging pressure: pressure increases significantly as length decreases below ~2 mm, but is independent for lengths > 2 mm.
  • A model was developed, characterizing network structure impact with parameter cⱼ; cⱼ dominates dislodging pressure for bubbles > 2 mm.

Conclusions:

  • Bubble dislodgment pressure is a function of bubble length, channel dimension, and network structure.
  • The proposed model accurately explains bubble dislodgment in complex capillary networks.
  • Parameter cⱼ is crucial for understanding and controlling bubble dislodgment in intricate microchannel systems.