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Related Experiment Videos

Faraday instability in a surface-frozen liquid.

P Huber1, V P Soprunyuk, J P Embs

  • 1Technische Physik, Universität des Saarlandes, 66041 Saarbrücken, Germany. p.huber@physik.uni-saarland.de

Physical Review Letters
|May 21, 2005
PubMed
Summary
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Surface freezing in tetracosanol (C24H50) melt causes a transition from free-slip to no-slip flow. This change in surface dynamics significantly impacts viscous dissipation near the melting point.

Area of Science:

  • Fluid dynamics
  • Surface science
  • Materials science

Background:

  • Faraday surface instability measurements reveal critical parameters for standing surface waves.
  • Tetracosanol (C24H50) melt exhibits unique thermal properties near its bulk freezing temperature.

Purpose of the Study:

  • To investigate the changes in critical acceleration (a(c)) and wave number (k(c)) for surface waves on tetracosanol melt.
  • To understand the underlying hydrodynamic mechanisms responsible for observed variations in surface instability.
  • To identify the role of surface freezing in altering fluid flow behavior.

Main Methods:

  • Experimental measurements of Faraday surface instability (critical acceleration and wave number).
  • Systematic variation of temperature and driving frequency.

Related Experiment Videos

  • Quantitative analysis using a hydrodynamic model.

    • Main Results:

    • Abrupt changes in a(c) and k(c) were observed at T(s)=54°C, approximately 4°C above the bulk freezing temperature.
    • A hydrodynamic model quantitatively explained the variations, indicating a shift in surface flow behavior.
    • The transition was from a free-slip surface flow (liquid state) to a surface-pinned, no-slip flow (near-solid interface).

    Conclusions:

    • Surface freezing initiates a transition in flow dynamics from free-slip to no-slip at the tetracosanol melt surface.
    • The steep velocity gradient in the no-slip flow regime significantly enhances viscous dissipation near the surface.
    • This study elucidates the impact of surface phase transitions on interfacial fluid dynamics.