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Open AccessArticle

Droplet Impact on the Super-Hydrophobic Surface with Micro-Pillar Arrays Fabricated by Hybrid Laser Ablation and Silanization Process

1
School of Mechanical Engineering, Tianjin University, Tianjin 300350, China
2
Key Laboratory of Mechanism Theory and Equipment Design, Ministry of Education, Tianjin University, Tianjin 300350, China
3
School of Engineering, University of Warwick, Coventry CV4 7AL, UK
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(5), 765; https://doi.org/10.3390/ma12050765
Received: 17 February 2019 / Revised: 1 March 2019 / Accepted: 4 March 2019 / Published: 6 March 2019
(This article belongs to the Section Thin Films)
A super-hydrophobic aluminum alloy surface with decorated pillar arrays was obtained by hybrid laser ablation and further silanization process. The as-prepared surface showed a high apparent contact angle of 158.2 ± 2.0° and low sliding angle of 3 ± 1°. Surface morphologies and surface chemistry were explored to obtain insights into the generation process of super-hydrophobicity. The main objective of this current work is to investigate the maximum spreading factor of water droplets impacting on the pillar-patterned super-hydrophobic surface based on the energy conservation concept. Although many previous studies have investigated the droplet impacting behavior on flat solid surfaces, the empirical models were proposed based on a few parameters including the Reynolds number (Re), Weber number (We), as well as the Ohnesorge number (Oh). This resulted in limitations for the super-hydrophobic surfaces due to the ignorance of the geometrical parameters of the pillars and viscous energy dissipation for liquid flow within the pillar arrays. In this paper, the maximum spreading factor was deduced from the perspective of energy balance, and the predicted results were in good agreement with our experimental results with a mean error of 4.99% and standard deviation of 0.10. View Full-Text
Keywords: nanosecond laser; super-hydrophobic; droplet impacting; maximum spreading factor; viscous dissipation nanosecond laser; super-hydrophobic; droplet impacting; maximum spreading factor; viscous dissipation
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Xia, Z.; Xiao, Y.; Yang, Z.; Li, L.; Wang, S.; Liu, X.; Tian, Y. Droplet Impact on the Super-Hydrophobic Surface with Micro-Pillar Arrays Fabricated by Hybrid Laser Ablation and Silanization Process. Materials 2019, 12, 765.

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