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Contact Time of Droplet Impact on Inclined Ridged Superhydrophobic Surfaces by Zhifeng Hu; Fuqiang Chu; Yukai Lin; Xiaomin Wu is a Materials Science article available to read on EtoBox.

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Superhydrophobic surfaces decorated with macrostructures have attracted extensive attention due to their excellent performance of reducing the contact time of impacting droplets. In many practical applications, the surface is not perpendicular to the droplet impact direction, but the impacting dynamics in such scenarios still remain mysterious. Here, we experimentally investigate the dynamics of droplet impact on inclined ridged superhydrophobic surfaces and reveal the effect of (the normal Weber number) and α (the inclination angle) on the contact time τ. As increases, τ first decreases rapidly until a platform is reached; if continues to increase, τ further reduces to a lower platform, indicating a three-stage variation of τ in low, middle, and high regions. In the middle and high regions, the contact time is reduced by 30 and 50%, respectively, and is dominated by droplet spreading/retraction in the tangential and lateral directions, respectively. A quantitative analysis demonstrates that τ in the middle and high regions is independent of and α, while the range of middle and high regions is related to α. When α < 30°, increasing α narrows the middle region and enlarges the high

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Author

Zhifeng Hu; Fuqiang Chu; Yukai Lin; Xiaomin Wu

Publisher

American Chemical Society (ACS)

Published

2022

Language

EN

Field

Materials Science (Physical Sciences)