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Marangoni convection in binary mixtures.

Jie Zhang1, Robert P Behringer, Alexander Oron

  • 1Department of Physics and Center for Nonlinear and Complex Systems, Duke University, North Carolina 27708, USA. jz26@phy.duke.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|August 7, 2007
PubMed
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Marangoni instabilities in NaCl/water mixtures were studied in an open system. Evaporation and the Soret effect drive pattern formation, differing from theoretical predictions.

Area of Science:

  • Fluid dynamics
  • Non-equilibrium thermodynamics
  • Pattern formation

Background:

  • Marangoni instabilities in pure liquids are well-studied, but experimental data for binary mixtures are scarce.
  • Binary mixtures exhibit complex phenomena due to coupled effects like Soret and evaporation.
  • Understanding these instabilities is crucial for various applications, including material processing and microfluidics.

Purpose of the Study:

  • To experimentally investigate Marangoni instabilities in NaCl/water binary mixtures under evaporation in an open system.
  • To analyze the influence of substrate temperature and solute concentration on pattern formation.
  • To compare experimental results with existing theoretical predictions.

Main Methods:

  • Utilizing binary mixtures of NaCl/water in an open system with inevitable water evaporation.

Related Experiment Videos

  • Employing the shadow-graph method to observe and record pattern evolution over time.
  • Systematically varying substrate temperatures and initial solute concentrations.

    • Main Results:

    • Observed pattern formation driven by surface-tension fluctuations from evaporation and the Soret effect.
    • Identified patterns primarily composed of polygons and rolls, evolving over time.
    • Found that evaporation impacts early stages, while the Soret effect becomes significant at later stages and higher concentrations.
    • Convection strength increases with initial solute concentration and substrate temperature.
    • Observed deviations from theoretical predictions that neglect evaporation.

    Conclusions:

    • Evaporation and the Soret effect significantly influence Marangoni instabilities in binary mixtures, leading to distinct pattern formation compared to pure liquids.
    • The interplay between evaporation and the Soret effect is critical, with evaporation dominating early dynamics and the Soret effect influencing later stages, especially at higher concentrations.
    • Experimental findings highlight the inadequacy of theoretical models that do not account for evaporation in such systems.