Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes (2024)

Kumar, A., Tripathy, A., Nam, Y., Lee, C., & Sen, P. (2018). Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes. Soft Matter, 14(9), 1571-1580. https://doi.org/10.1039/c7sm02145c

Kumar, Arvind ; Tripathy, Abinash ; Nam, Youngsuk et al. / Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes. In: Soft Matter. 2018 ; Vol. 14, No. 9. pp. 1571-1580.

@article{ed8ddbdd8c7e4f0896b0ed65dfd4cfb5,

title = "Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes",

abstract = "When a droplet impacts a superhydrophobic sieve, a part of the droplet penetrates through it when the dynamic pressure (ρU2) 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 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 use under impact scenarios.",

author = "Arvind Kumar and Abinash Tripathy and Youngsuk Nam and Choongyeop Lee and Prosenjit Sen",

note = "Publisher Copyright: {\textcopyright} 2018 The Royal Society of Chemistry.",

year = "2018",

doi = "10.1039/c7sm02145c",

language = "English",

volume = "14",

pages = "1571--1580",

journal = "Soft Matter",

issn = "1744-683X",

number = "9",

}

Kumar, A, Tripathy, A, Nam, Y, Lee, C & Sen, P 2018, 'Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes', Soft Matter, vol. 14, no. 9, pp. 1571-1580. https://doi.org/10.1039/c7sm02145c

Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes. / Kumar, Arvind; Tripathy, Abinash; Nam, Youngsuk et al.
In: Soft Matter, Vol. 14, No. 9, 2018, p. 1571-1580.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes

AU - Kumar, Arvind

AU - Tripathy, Abinash

AU - Nam, Youngsuk

AU - Lee, Choongyeop

AU - Sen, Prosenjit

N1 - Publisher Copyright:© 2018 The Royal Society of Chemistry.

PY - 2018

Y1 - 2018

N2 - When a droplet impacts a superhydrophobic sieve, a part of the droplet penetrates through it when the dynamic pressure (ρU2) 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 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 use under impact scenarios.

AB - When a droplet impacts a superhydrophobic sieve, a part of the droplet penetrates through it when the dynamic pressure (ρU2) 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 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 use under impact scenarios.

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U2 - 10.1039/c7sm02145c

DO - 10.1039/c7sm02145c

M3 - Article

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AN - SCOPUS:85042733583

SN - 1744-683X

VL - 14

SP - 1571

EP - 1580

JO - Soft Matter

JF - Soft Matter

IS - 9

ER -

Kumar A, Tripathy A, Nam Y, Lee C, Sen P. Effect of geometrical parameters on rebound of impacting droplets on leaky superhydrophobic meshes. Soft Matter. 2018;14(9):1571-1580. doi: 10.1039/c7sm02145c