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Stable-streamlined cavities following the impact of non-superhydrophobic spheres on water

Abstract

The formation of stable-streamlined gas cavity fallowing the impact of a heated Leidenfrost sphere on a liquid surface or a superhydrophobic sphere on water is a recently demonstrated phenomenon. The sphere encapsulated in teardrop-shaped gas cavity was found to have near-zero hydrodynamic drag due to the self-adjusting streamlined shape and the free-slip boundary condition on the cavity interface. Here we show that such cavities can as well be formed following the water impact from a sufficient height of non-superhydrophobic spheres with water contact angles between > 30° and 120°. In this case the streamlined cavity is attached just above the sphere’s equator, instead of entirely wrapping the sphere. Nevertheless, this sphere with attached cavity formation has near-zero drag and predetermined free fall velocity in compliance with the Bernoulli law of potential flow. The effect of surfactant addition to the water solution is investigated. The shape and fall velocity of sphere with streamlined cavity formation were unaffected by the addition of low surface modulus synthetic surfactants, but were destabilised when a solution containing high surface modulus surfactants, such as soaps were used.

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Publication details

The article was received on 22 May 2019, accepted on 09 Jul 2019 and first published on 10 Jul 2019


Article type: Paper
DOI: 10.1039/C9SM01025D
Soft Matter, 2019, Accepted Manuscript
  • Open access: Creative Commons BY-NC license
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    Stable-streamlined cavities following the impact of non-superhydrophobic spheres on water

    I. U. Vakarelski, A. Jetly and S. T. Thoroddsen, Soft Matter, 2019, Accepted Manuscript , DOI: 10.1039/C9SM01025D

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