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Microbubble flows in superwettable fluidic channels.

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Controlling underwater microbubble flow in superwettable channels reveals distinct behaviors. Microbubbles generate vortices on superaerophilic surfaces and oscillate on superaerophobic surfaces, impacting drag reduction principles.

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Area of Science:

  • Fluid Dynamics
  • Surface Science
  • Microfluidics

Background:

  • Controlling underwater bubble adhesion is crucial for diverse applications.
  • Bubble dynamics under flow conditions remain largely unexplored.
  • Wettability plays a key role in fluid-structure interactions.

Purpose of the Study:

  • To investigate the wetting dynamics of underwater microbubble streams in superwettable channels.
  • To understand the influence of flow conditions on microbubble behavior.
  • To explore the relationship between wettability and drag reduction.

Main Methods:

  • Generated underwater microbubble streams using a microfluidic device integrated with an electrochemical system.
  • Visualized microbubble motion via high-speed camera tracking.
  • Observed bubble behavior in both superaerophilic and superaerophobic channels under varying flow regimes (laminar and turbulent).

Main Results:

  • A vortex was generated in the air layer of the superaerophilic surface under laminar flow conditions.
  • Microbubbles were transported along the superaerophilic surface under turbulent conditions, driven by air film dynamics.
  • Microbubbles exhibited backward and forward oscillations on the superaerophobic surface under turbulent conditions.

Conclusions:

  • The study elucidates microbubble behavior in superwettable channels under flow.
  • Findings contribute to understanding drag reduction mechanisms through wettability control.
  • The research provides insights into the dynamic motion of microbubble streams for potential applications.