Bouncing dynamics of impact droplets on the convex superhydrophobic surfaces

Bouncing dynamics of impact droplets on solid surfaces intensively appeal to researchers due to the importance in many industrial fields. Here, we found that droplets impacting onto dome convex superhydrophobic surfaces could rapidly bounce off with a 28.5% reduction in the contact time, compared wi...

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Bibliographic Details
Published in:Applied physics letters 2017-05, Vol.110 (22)
Main Authors: Shen, Yizhou, Liu, Senyun, Zhu, Chunling, Tao, Jie, Chen, Zhong, Tao, Haijun, Pan, Lei, Wang, Guanyu, Wang, Tao
Format: Article
Language:English
Subjects:
Annuli
Applied physics
Bouncing
Computer simulation
Convexity
Domes
Droplets
Hydrophobic surfaces
Hydrophobicity
Solid surfaces
Surface energy
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Summary:Bouncing dynamics of impact droplets on solid surfaces intensively appeal to researchers due to the importance in many industrial fields. Here, we found that droplets impacting onto dome convex superhydrophobic surfaces could rapidly bounce off with a 28.5% reduction in the contact time, compared with that on flat superhydrophobic surfaces. This is mainly determined by the retracting process of impact droplets. Under the action of dome convexity, the impact droplet gradually evolves into an annulus shape with a special hydrodynamic distribution. As a consequence, both the inner and external rims of the annulus shape droplet possess a higher retracting velocity under the actions of the inertia force and the surface energy change, respectively. Also, the numerical simulation provides a quantitative evidence to further verify the interpretation on the regimes behind the rapidly detached phenomenon of impact droplets.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4984230