Enhanced drag reduction of superhydrophobic coatings with femtosecond laser processing and TEOS/KH-SiO2/SA hybridization: CFD simulation and particle image velocimetry

被引：0

作者：

Jiang, Xinghe ^{[1
]}

Zhou, Changjiang ^{[1
]}

Su, Jie ^{[2
]}

Li, Ning ^{[1
]}

Tang, Shan ^{[1
]}

机构：

[1] State Key Laboratory of Advanced Design and Manufacture for Vehicle Body, Hunan University, Changsha,410082, China

[2] Hunan Provincial Key Laboratory of Intelligent Manufacturing Technology for High-performance Mechanical Equipment, Changsha University of Science and Technology, Changsha,410114, China

来源：

Progress in Organic Coatings | 2024年 / 197卷

基金：

中国国家自然科学基金;

关键词：

% reductions - Computational fluid - Femtoseconds - Fluid-dynamics - Micronanostructure - Particle images - SiO 2 - Superhydrophobic - Superhydrophobic coatings - Tetraethyl orthosilicates;

D O I：

10.1016/j.porgcoat.2024.108865

中图分类号：

学科分类号：

摘要：

Superhydrophobic surfaces have gained significant attention due to their potential applications in reducing frictional drag in various fluid flow systems. These surfaces mimic the lotus leaf's natural water-repellent properties, resulting in minimal contact between water droplets and the surface. The F-L@TEOS/KH-SiO2/SA coatings are developed using a combination of femtosecond laser ablation and chemical modification with tetraethyl orthosilicate (TEOS), KH550-modified SiO2 (KH-SiO2), and stearic acid (SA). The micro-nano structures formed on the surface enhanced its hydrophobicity, with a contact angle (CA) of 165.94°and sliding angle (SA) of 2.35°. The drag reduction performance is evaluated through experimental methods, including particle image velocimetry and gravity-driven motion analysis, as well as numerical simulations using computational fluid dynamics (CFD). Results showed that the superhydrophobic surface significantly reduced drag compared to untreated aluminum, with an average drag reduction ratio of 10.4 % in experiments and a calculated reduction rate of 9.86 % in simulations. The presence of micro-nano structures promoted the formation of an air layer at the solid-liquid interface, decreasing friction and enhancing slip flow. Additionally, the biomimetic surface generated turbulence at specific distances, aiding in energy dissipation and further reducing resistance. These findings demonstrate the potential of superhydrophobic coatings for applications requiring reduced fluid resistance, such as in marine vessels, pipelines, and fluid transport systems. © 2024 Elsevier B.V.

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