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Interfacial pattern selection in miscible liquids under vibration.

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Horizontal vibration of miscible liquids creates distinct patterns. Microgravity experiments reveal vertical liquid columns, unlike the saw-tooth structures observed on Earth.

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Area of Science:

  • Fluid dynamics
  • Interface phenomena
  • Non-equilibrium physics

Background:

  • Understanding liquid interfaces is crucial in various scientific fields.
  • The behavior of miscible liquids under external forces is complex and not fully understood.
  • Previous studies have not extensively investigated low-frequency horizontal vibration effects on liquid interfaces.

Purpose of the Study:

  • To investigate the pattern formation at the interface of two miscible liquids under horizontal vibration.
  • To compare the resulting interface structures in microgravity versus Earth's gravity.
  • To analyze the influence of vibration frequency (below 25 Hz) on pattern evolution.

Main Methods:

  • Experimental setup involving two miscible liquids with similar viscosities and densities.
  • Application of horizontal vibration at frequencies below 25 Hz.
  • Comparison of experiments conducted in a gravity field and under microgravity conditions (parabolic flight).

Main Results:

  • In Earth's gravity, a spatially periodic saw-tooth frozen structure forms at the interface, which dissipates over time.
  • Under microgravity conditions, a long-lived pattern of vertical columns of alternating liquids is observed.
  • Significant differences in pattern structure were noted between ground and microgravity experiments.

Conclusions:

  • Gravity plays a critical role in determining the interface structure of vibrating miscible liquids.
  • Microgravity conditions promote the formation of stable, vertically oriented patterns.
  • The findings offer new insights into fluid behavior under reduced gravity and vibration.