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Related Experiment Videos

Droplet motion with phase change in a temperature gradient.

Akira Onuki1, Kentaro Kanatani

  • 1Department of Physics, Kyoto University, Kyoto 606-8502, Japan.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|February 21, 2006
PubMed
Summary

First-order phase transitions significantly alter droplet dynamics in fluids. Latent heat release suppresses the Marangoni effect, leading to slower droplet motion and near-homogeneous internal temperatures.

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Area of Science:

  • Fluid dynamics
  • Thermodynamics
  • Interfacial phenomena

Background:

  • Droplet motion is crucial in various physical and chemical processes.
  • Understanding fluid behavior under temperature gradients is essential for many applications.
  • The influence of phase transitions on droplet hydrodynamics requires further investigation.

Purpose of the Study:

  • To investigate the impact of first-order phase transitions on droplet motion in one-component fluids.
  • To analyze how interfacial latent heat affects hydrodynamic flow and temperature distribution around droplets.
  • To quantify the suppression of the Marangoni effect and droplet velocity changes.

Main Methods:

  • Solving linearized hydrodynamic equations.
  • Incorporating relevant surface boundary conditions.

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  • Analyzing the effects of phase transitions at the droplet interface.

    • Main Results:

    • First-order phase transitions strongly influence droplet velocity fields and surrounding temperatures.
    • Interfacial latent heat significantly alters hydrodynamic flow patterns.
    • The Marangoni effect is substantially suppressed due to near-homogeneous internal droplet temperatures.
    • Droplet velocity experiences significant deceleration.

    Conclusions:

    • First-order phase transitions are a critical factor in droplet dynamics under thermal gradients.
    • The release or absorption of latent heat fundamentally modifies fluid behavior around droplets.
    • These findings have implications for understanding and controlling multiphase flows in various systems.