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Film Control to Study Contributions of Waves to Droplet Impact Dynamics on Thin Flowing Liquid Films
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Published on: August 18, 2018

Crown-forming instability phenomena in the drop splash problem.

Rouslan Krechetnikov1, George M Homsy

  • 1Department of Mathematics, University of Alberta, Edmonton, Canada.

Journal of Colloid and Interface Science
|January 16, 2009
PubMed
Summary

The study identifies the Richtmyer-Meshkov instability as the key mechanism driving crown formation during liquid drop splashing. Researchers also observed unique wave number selection phenomena in the resulting crown spike structures.

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Area of Science:

  • Fluid Dynamics
  • Instability Phenomena
  • Interface Physics

Background:

  • Drop splashing on liquid films is a common phenomenon with complex dynamics.
  • Understanding crown formation is crucial for predicting splashing outcomes.
  • Previous studies have explored various mechanisms, but a definitive instability has remained elusive.

Purpose of the Study:

  • To investigate the fundamental instability driving crown formation during drop splashing.
  • To identify the primary physical mechanism responsible for the initial interface acceleration.
  • To analyze the wave number selection and bifurcation behavior of the crown spike structure.

Main Methods:

  • Combined experimental observations with theoretical analysis.
  • Focused on the dynamics of a liquid drop impacting a pre-existing liquid film.
  • Investigated the interface acceleration and subsequent instability development.

Main Results:

  • The Richtmyer-Meshkov type instability, driven by near-impulsive interface acceleration, is identified as the dominant mechanism.
  • Observed and characterized frustration phenomena in the wave number selection of the crown spikes.
  • Mapped the bifurcation picture associated with these phenomena.

Conclusions:

  • The Richtmyer-Meshkov instability provides a robust explanation for crown formation in this scenario.
  • The discovered frustration phenomena offer new insights into pattern selection in fluid instabilities.
  • This work advances the fundamental understanding of splashing dynamics and interfacial instabilities.