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Bubble eruptions in a multilayer Hele-Shaw flow.

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Summary
This summary is machine-generated.

Gravitationally unstable fluids in a Hele-Shaw cell exhibit complex dynamics. Air fingers erupt through viscous layers, creating droplet sprays and demonstrating counterflows against buoyancy.

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Area of Science:

  • Fluid dynamics
  • Multiphase flow
  • Hele-Shaw cell dynamics

Background:

  • Studying fluid behavior in confined geometries is crucial for understanding complex interfacial phenomena.
  • Gravitational instability drives fluid rearrangement in layered systems.

Purpose of the Study:

  • To investigate the dynamical rearrangement of gravitationally unstable multilayer fluids in a Hele-Shaw cell.
  • To classify various stirring and breakthrough dynamics, and characterize air-finger eruptions.

Main Methods:

  • Utilized a Hele-Shaw cell with four immiscible fluid layers (air, olive oil, water-glycerin, perfluorohexane).
  • Varied fluid properties (viscosity) and layer thicknesses.
  • Employed high-speed video to capture and analyze fluid dynamics, including eruptions, wetting, and contact lines.

Main Results:

  • Observed distinct dynamics including stirring, layer breakthrough, and counterflows against buoyancy.
  • Documented prominent air-finger eruptions through high-viscosity layers, forming hemispherical shapes and generating droplet sprays via neck pinch-off.
  • Identified significant roles of wetting, contact lines, and three-dimensionality in eruption dynamics.
  • Noted that droplet motion is influenced by both local viscosity and density gradients.

Conclusions:

  • The study reveals complex, often counterintuitive, fluid behaviors in layered Hele-Shaw systems.
  • Air-finger eruptions and subsequent droplet formation are key phenomena driven by interfacial and viscous forces.
  • Layer interchange and overturning dynamics occur on longer timescales, influenced by multi-phase interactions.