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Anisotropic drop spreading on superhydrophobic grates during drop impact

Abstract

We study the influence of geometric anisotropy of micro-grate structures on spreading dynamics of water drop 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 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 possible influences coming from the Cassie-to-Wenzel transition and circumferential contact angle variation on the spreading diameter. Then, based on a simplified energy balance model incorporating a slip length, we propose that a 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 understanding the role of microstructures in controlling drop dynamics during impact, which has relevance to various engineering applications.

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Publication details

The article was received on 05 Feb 2018, accepted on 08 Apr 2018 and first published on 10 Apr 2018


Article type: Paper
DOI: 10.1039/C8SM00259B
Citation: Soft Matter, 2018, Accepted Manuscript
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    Anisotropic drop spreading on superhydrophobic grates during drop impact

    J. Han, S. Ryu, H. Kim, P. Sen, D. Choi, Y. Nam and C. Lee, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C8SM00259B

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