Water Penetration through a Superhydrophobic Mesh During a Drop Impact

Ryu, Seunggeol and Sen, Prosenjit and Nam, Youngsuk and Lee, Choongyeop (2017) Water Penetration through a Superhydrophobic Mesh During a Drop Impact. In: Physical Review Letters, 118 (1). ISSN 0031-9007

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Abstract

When a water drop impacts a mesh having submillimeter pores, a part of the drop penetrates through the mesh if the impact velocity is sufficiently large. Here we show that different surface wettability, i.e., hydrophobicity and superhydrophobicity, leads to different water penetration dynamics on a mesh during drop impact. We show, despite the water repellence of a superhydrophobic surface, that water can penetrate a superhydrophobic mesh more easily (i.e., at a lower impact velocity) over a hydrophobic mesh via a penetration mechanism unique to a superhydrophobic mesh. On a superhydrophobic mesh, the water penetration can occur during the drop recoil stage, which appears at a lower impact velocity than the critical impact velocity for water penetration right upon impact. We propose that this unique water penetration on a superhydrophobic mesh can be attributed to the combination of the hydrodynamic focusing and the momentum transfer from the water drop when it is about to bounce off the surface, at which point the water drop retrieves most of its kinetic energy due to the negligible friction on superhydrophobic surfaces.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	American Physical Society
Additional Information:	The copyright for this article belongs to the American Physical Society.
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	01 Jun 2022 06:33
Last Modified:	01 Jun 2022 06:33
URI:	https://eprints.iisc.ac.in/id/eprint/73087

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