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Vortex-induced morphology on a two-fluid interface and the transitions.

J-C Tsai1, C-Y Tao1, Y-C Sun2

  • 1Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.

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Summary
This summary is machine-generated.

This study reveals how rotating fluids in a cylinder create a flattop interface structure due to vortex breakdown. Interface deformability also influences vortex development and surface instabilities.

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Area of Science:

  • Fluid dynamics
  • Interface phenomena
  • Non-Newtonian fluid mechanics

Background:

  • Investigating fluid behavior in confined geometries is crucial for understanding complex systems.
  • The interplay between flow fields and interface morphology in multi-component fluids remains an active research area.
  • Vortex breakdown is a known phenomenon, but its role in shaping fluid interfaces requires further exploration.

Purpose of the Study:

  • To experimentally investigate steady flow patterns in a cylinder with two immiscible liquids.
  • To elucidate the relationship between fluid flow, interface morphology, and vortex dynamics.
  • To identify the underlying mechanisms responsible for the observed flattop interface structure.

Main Methods:

  • Experimental setup involving a rotating cylinder containing two immiscible liquids.
  • Flow visualization techniques to monitor the topological structure of the flow fields.
  • Systematic variation of rotational speeds and aspect ratios to observe different flow regimes.

Main Results:

  • Observed a direct link between vortex breakdown and the formation of a stable flattop interface structure.
  • Demonstrated that the deformability of the interface positively influences vortex development.
  • Identified various surface instabilities associated with steady states across different aspect ratios.

Conclusions:

  • The flattop interface structure is a direct consequence of vortex breakdown, modulated by interface deformability.
  • Flow field topology is key to understanding base states and transitions in interface morphology.
  • The study highlights rich surface instability phenomena in confined, rotating two-fluid systems.