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Ferrofluid Leidenfrost droplets.

Christophe D'Angelo1, Christophe Raufaste, Pavel Kuzhir

  • 1Université Côte d'Azur, CNRS UMR 7010, Institut de Physique de Nice, Parc Valrose, 06100 Nice, France. Franck.Celestini@unice.fr.

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|June 22, 2019
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Summary
This summary is machine-generated.

Magnetic fields alter ferrofluid Leidenfrost droplets on hot surfaces. Droplet evaporation and takeoff are controlled by magnetic forces and droplet size, with bouncing instabilities observed.

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Area of Science:

  • Fluid dynamics
  • Magnetohydrodynamics
  • Materials science

Background:

  • The Leidenfrost effect describes a liquid droplet levitating on a hot surface due to a vapor layer.
  • Ferrofluids, colloidal suspensions of magnetic nanoparticles, exhibit unique responses to magnetic fields.
  • Understanding ferrofluid behavior under extreme conditions, like the Leidenfrost state, is crucial for various applications.

Purpose of the Study:

  • To experimentally investigate the behavior of ferrofluid Leidenfrost droplets under a static magnetic field gradient.
  • To analyze the influence of magnetic forces on droplet evaporation, takeoff, and stability.

Main Methods:

  • Experimental setup involving ferrofluid droplets on a hot substrate above a permanent magnet.
  • Controlled variation of the distance between the substrate and the magnet.
  • Observation and analysis of droplet evaporation rate, takeoff radius, and bouncing dynamics.

Main Results:

  • Droplet evaporation rate is significantly affected by the magnetic field strength (distance d).
  • Droplets exhibit takeoff from the substrate at a critical radius, predictable with an effective gravity model.
  • An instability leading to irregular bouncing was observed and qualitatively explained by synchronization phenomena.

Conclusions:

  • Magnetic field gradients can effectively control ferrofluid Leidenfrost droplet dynamics.
  • The interplay between magnetic forces, evaporation, and droplet size governs droplet behavior.
  • Synchronization of free fall and vibration modes offers a potential explanation for observed bouncing instabilities.