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Effect of Geometrical Parameters on Rebound of Impacting Droplets on Leaky Superhydrophobic Meshes

Abstract

When droplet impacts a superhydrophobic sieve, a part of the droplet penetrates through it when the dynamic pressure (ρU^2) of the impinging droplet exceeds the breakthrough pressure (γΓ⁄A). At higher impact velocities the ejected-jet breaks and separates from the main droplet. The remaining part of the droplet bounces off the surface showing different modes (normal bouncing as a vertically elongated drop or pancake bouncing). In this work, we have studied the effect of different geometrical parameters of superhydrophobic copper meshes on different modes of droplet rebound. We observe three different effects in our study. Firstly, we observe pancake like bouncing which is attributed to the capillary energy of the rebounding interface formed after the breaking of the ejected-jet. Secondly, we observe that leakage of the droplet volume and kinetic energy due to the breaking of the ejected-jet which leads to reduction in the contact times. Finally, we observe that for flexible meshes the transition to pancake type bouncing is induced at lower Weber numbers. Flexibility also leads to a reduction in the volume loss from the ejected-jet. This study will be helpful in the design of superhydrophobic meshes for its use under impact scenario.

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Supplementary files

Publication details

The article was received on 31 Oct 2017, accepted on 08 Jan 2018 and first published on 09 Jan 2018


Article type: Paper
DOI: 10.1039/C7SM02145C
Citation: Soft Matter, 2018, Accepted Manuscript
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    Effect of Geometrical Parameters on Rebound of Impacting Droplets on Leaky Superhydrophobic Meshes

    A. Kumar, A. Tripathy, Y. Nam, C. Lee and P. Sen, Soft Matter, 2018, Accepted Manuscript , DOI: 10.1039/C7SM02145C

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