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Anisotropic drop spreading on superhydrophobic grates during drop impact

Han, Jeonghoon and Ryu, Seunggeol and Kim, Hyunsik and Sen, Prosenjit and Choi, Dukhyun and Nam, Youngsuk and Lee, Choongyeop (2018) Anisotropic drop spreading on superhydrophobic grates during drop impact. In: SOFT MATTER, 14 (19). pp. 3760-3767.

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Official URL: http://dx.doi.org/10.1039/c8sm00259b

Abstract

We study the influence of geometric anisotropy of micro-grate structures on the spreading dynamics of water drops after impact. It is found that the maximal spreading diameter along the parallel direction to grates becomes larger than that along the transverse direction beyond a certain Weber number, while the extent of such an asymmetric spreading increases with the structural pitch of grates and Weber number. By employing grates covered with nanostructures, we exclude the possible influences coming from the Cassie-to-Wenzel transition and the circumferential contact angle variation on the spreading diameter. Then, based on a simplified energy balance model incorporating slip length, we propose that slip length selectively enhances the spreading diameter along the parallel direction, being responsible for the asymmetric drop spreading. We believe that our work will help better understand the role of microstructures in controlling the drop dynamics during impact, which has relevance to various engineering applications.

Item Type: Journal Article
Additional Information: Copy right for this article belong to ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre: Division of Interdisciplinary Research > Centre for Nano Science and Engineering
Depositing User: Id for Latest eprints
Date Deposited: 05 Jun 2018 14:07
Last Modified: 05 Jun 2018 14:07
URI: http://eprints.iisc.ac.in/id/eprint/59949

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