{"title":"Drag reduction performance of hydrophobic coatings with controllable wettability","authors":"","doi":"10.1016/j.porgcoat.2024.108742","DOIUrl":null,"url":null,"abstract":"<div><p>Currently, an increasing number of studies focus on the applications of hydrophobic surfaces for underwater drag reduction. However, the drag reduction mechanisms of hydrophobic coatings with controllable wettability still lack systematic understanding. Herein, nano-SiO<sub>2</sub> composite coatings with different contact angles were fabricated using air spraying techniques. The relationship between the hydrophobicity of these coatings and their drag reduction performance under different Reynolds numbers was further investigated. The results showed that the uniformed distributed air layer and low depinning force significantly contributed to drag reduction performance. The coating with a contact angle of 140° achieved a maximum reduction rate of 58 % at a Reynolds number of 750. However, the coatings with contact angles of 150° and 155° exhibited diminished drag reduction effects due to the uneven distribution of the air film. This study highlighted that the hydrophobicity of the coatings and the uniform microstructures are essential for sustaining effective drag reduction performance.</p></div>","PeriodicalId":20834,"journal":{"name":"Progress in Organic Coatings","volume":null,"pages":null},"PeriodicalIF":6.5000,"publicationDate":"2024-08-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Progress in Organic Coatings","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0300944024005344","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
Currently, an increasing number of studies focus on the applications of hydrophobic surfaces for underwater drag reduction. However, the drag reduction mechanisms of hydrophobic coatings with controllable wettability still lack systematic understanding. Herein, nano-SiO2 composite coatings with different contact angles were fabricated using air spraying techniques. The relationship between the hydrophobicity of these coatings and their drag reduction performance under different Reynolds numbers was further investigated. The results showed that the uniformed distributed air layer and low depinning force significantly contributed to drag reduction performance. The coating with a contact angle of 140° achieved a maximum reduction rate of 58 % at a Reynolds number of 750. However, the coatings with contact angles of 150° and 155° exhibited diminished drag reduction effects due to the uneven distribution of the air film. This study highlighted that the hydrophobicity of the coatings and the uniform microstructures are essential for sustaining effective drag reduction performance.
期刊介绍:
The aim of this international journal is to analyse and publicise the progress and current state of knowledge in the field of organic coatings and related materials. The Editors and the Editorial Board members will solicit both review and research papers from academic and industrial scientists who are actively engaged in research and development or, in the case of review papers, have extensive experience in the subject to be reviewed. Unsolicited manuscripts will be accepted if they meet the journal''s requirements. The journal publishes papers dealing with such subjects as:
• Chemical, physical and technological properties of organic coatings and related materials
• Problems and methods of preparation, manufacture and application of these materials
• Performance, testing and analysis.