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Ballistics of self-jumping microdroplets

Pierre Lecointre1,2, Timothée Mouterde1,2, Antonio Checco3, Charles T. Black4, Atikur Rahman5, Christophe Clanet1,2, and David Quéré1,2,*

  • 1Physique et Mécanique des Milieux Hétérogènes, UMR 7636 du CNRS, ESPCI, 75005 Paris, France
  • 2Laboratoire d'Hydrodynamique de l'X, UMR 7646 du CNRS, École polytechnique, 91128 Palaiseau, France
  • 3Mechanical Engineering Department, Stony Brook University, Stony Brook, New York 11794, USA
  • 4Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 5Department of Physics, Indian Institute of Science Education and Research (IISER)-Pune, Maharashtra 411008, India

  • *Corresponding author: david.quere@espci.fr
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Phys. Rev. Fluids 4, 013601 – Published 7 January, 2019

DOI: https://doi.org/10.1103/PhysRevFluids.4.013601

Abstract

Water-repellent materials ideally operate at very different liquid scales: from centimeter-size for bugs living on ponds through millimeter-size for antirain functions to micrometer-size for antifogging solids. In the last situation, it was recently evidenced that microdrops condensing on a highly nonadhesive substrate can take advantage from coalescence to jump off the material, even if the dynamical characteristics of the jump were not established at such microscales. We demonstrate in this paper that the jumping speed of drops is nonmonotonic with the drop size, showing a maximum around 5μm (a size commonly observed in dew), below and above which viscous and inertial effects, respectively, impede the takeoff. We quantitatively describe this optimum in antifogging. We also studied the ballistics of the jumping microdrops, from the height they reached to their behavior at landing; a situation where retakeoff is surprisingly found to be nearly unachievable despite the extreme nonwettability of the material.

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Phys. Rev. Fluids 4, 013601– Published 7 January, 2019
  • Received 5 September 2018
Article part of CHORUS
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