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Drag reduction on drop during impact on multiscale superhydrophobic surfaces

Published online by Cambridge University Press:  08 April 2020

Grégoire Martouzet ,
Choongyeop Lee ,
Christophe Pirat ,
Christophe Ybert Open the ORCID record for Christophe Ybert [Opens in a new window]  and
Anne-Laure Biance Open the ORCID record for Anne-Laure Biance [Opens in a new window]
Grégoire Martouzet
Affiliation:
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, VILLEURBANNE, France
Choongyeop Lee
Affiliation:
Department of Mechanical Engineering, Kyung Hee University, Yongin17104, Republic of Korea
Christophe Pirat
Affiliation:
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, VILLEURBANNE, France
Christophe Ybert
Affiliation:
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, VILLEURBANNE, France
Anne-Laure Biance*
Affiliation:
Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, F-69622, VILLEURBANNE, France
*
†Email address for correspondence: [email protected]
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Abstract

Liquid drop impact dynamics depends on the liquid–substrate interaction. In particular, when liquid–solid friction is decreased, the spreading of the impacting drop lasts longer. We characterise this effect by using two types of superhydrophobic surfaces, with similar wetting properties but different friction coefficients. It is found that, for large enough impact velocities, a reduced friction delays the buildup of a viscous boundary layer, and leads to an increase of the time required to reach the maximal radius of the impacting drop. An asymptotic analysis is carried out to quantify this effect, and agrees well with the experimental findings. Interestingly, this novel description complements the general picture of drop impact on solid surfaces, and more generally addresses the issue of drag reduction in the presence of slippage for non-stationary flows.

JFM classification

Drops and Bubbles: Drops Flow Control: Drag reduction Interfacial Flows (free surface): Capillary flows
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 892 , 10 June 2020 , R2
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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