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Interfacial Wave Motions Due to Marangoni Instability.

Wierschem1, Velarde, Linde

  • 1Instituto Pluridisciplinar, Paseo Juan XXIII, Madrid, E-28040, Spain

Journal of Colloid and Interface Science
|March 27, 1999
PubMed
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Localized disturbances in liquid layers create traveling waves due to surface adsorption. These waves exhibit complex 3D features and can form stationary patterns within annular containers.

Area of Science:

  • Fluid dynamics
  • Surface chemistry
  • Nonlinear phenomena

Background:

  • Miscible surface-active substances can adsorb and absorb into liquid layers.
  • The Marangoni effect drives fluid motion due to surface tension gradients.
  • Annular containers provide a confined geometry for studying wave propagation.

Purpose of the Study:

  • To investigate the generation and behavior of traveling periodic wavetrains in liquid layers within annular containers.
  • To analyze the role of the Marangoni effect in initiating wave disturbances.
  • To characterize the properties of these waves, including their dimensionality and evolution.

Main Methods:

  • Observation of traveling periodic wavetrains using shadowgraph imaging.
  • Analysis of wave evolution and modulation through space-time diagrams.

Related Experiment Videos

  • Measurement of wave properties such as frequency, amplitude, and surface deformation.
  • Estimation of the Marangoni number over time.

    • Main Results:

    • Localized shock-wave-like disturbances nucleate due to the Marangoni effect.
    • These disturbances evolve into three-dimensional traveling surface-wave trains.
    • Waves propagate through the annular container or form stationary source-and-sink states.
    • The study quantifies wave characteristics and their relationship to the Marangoni number.

    Conclusions:

    • The Marangoni effect is a key driver for generating complex wave phenomena in such systems.
    • The observed waves exhibit rich spatio-temporal dynamics, including modulation and pattern formation.
    • This research provides insights into interfacial phenomena and wave propagation in confined geometries.