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Azimuthal rotation induced by the Marangoni force makes small Leidenfrost droplets move in random zigzag directions

Ken Yamamoto (山本 憲)

  • Department of Earth and Space Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan and Water Frontier Research Center (WaTUS), Tokyo University of Science, 6-3-1 Niijuku, Katsushika-ku, Tokyo 125-8585, Japan

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Phys. Rev. Fluids 8, 093603 – Published 22 September, 2023

DOI: https://doi.org/10.1103/PhysRevFluids.8.093603

Abstract

We observed the zigzag motion of small Leidenfrost water droplets (radii less than 0.6 mm) on a hot, flat substrate. To understand this motion, we conducted an experiment using a glass capillary to fix a droplet at its edge and control the droplet height. Thermographic and interferometric observations reveal that the droplets rotated both vertically and azimuthally. Based on the characteristic frequency of the azimuthal rotation depending on the substrate temperature and droplet height, we developed a semiempirical model considering unsteady Marangoni convection and its relaxation. We confirmed that our model can predict the characteristic time of the zigzag motion of unfixed Leidenfrost droplets.

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References (23)

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Phys. Rev. Fluids 8, 093603– Published 22 September, 2023
  • Received 28 March 2023
  • Accepted 31 August 2023
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