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Related Experiment Videos

Interactions between two bubbles on a hot or cold wall.

Hiroki Kasumi1, Paul J Sides, John L Anderson

  • 1Mitsui Chemicals, 580-32 Nagaura, Sodegaura 299-0265, Japan.

Journal of Colloid and Interface Science
|June 29, 2004
PubMed
Summary
This summary is machine-generated.

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Temperature gradients drive bubble motion via thermal Marangoni stress. New models quantify two-bubble interactions, revealing that proximity increases approach velocity, contrary to expectations.

Area of Science:

  • Fluid dynamics
  • Thermodynamics
  • Surface science

Background:

  • Temperature gradients induce two-dimensional fluid motion and bubble aggregation/separation.
  • Bubble movement originates from thermal Marangoni stress driving fluid convection.
  • Prior theories analyzed single bubbles, not multi-bubble interactions.

Purpose of the Study:

  • To extend existing theories by modeling the dynamics of two interacting bubbles.
  • To develop a quantitative model for the relative velocity of two bubbles.
  • To investigate the influence of bubble separation and proximity to a surface on their interaction.

Main Methods:

  • Solving quasi-steady equations for temperature and velocity fields for two bubbles.
  • Utilizing asymptotic analysis to study thermocapillary forces at close separations.

Related Experiment Videos

  • Comparing theoretical predictions with experimental measurements of bubble velocities.

    • Main Results:

    • A quantitative model for the relative velocity between two bubbles was developed.
    • Bubble interactions were found to significantly increase the approach velocity.
    • The model accurately predicts experimental velocities, with slight overestimation.

    Conclusions:

    • The developed two-bubble theory provides a more accurate description of bubble dynamics.
    • Thermocapillary forces play a critical, singular role in bubble interactions at close distances.
    • The study enhances understanding of convective fluid motion driven by thermal gradients.