Maintenance of air layer and drag reduction on superhydrophobic surface | |
Department | 先进润滑与防护材料研究发展中心 |
Du, Peng1,2; Wen, Jun1; Zhang ZZ(张招柱)3; Song, Dong1; A. Ouahsine2; Hu, Haibao1 | |
The second department | 固体润滑国家重点实验室 |
2017 | |
Source Publication | Ocean Engineering |
ISSN | 0029-8018 |
Volume | 130Pages:328-335 |
Abstract | Hydrophobic surface for drag reduction on marine vehicles and structures has been proposed for many years. However, the drag reduction effect has been found to be unstable under high flow speed/pressure conditions because of the destruction of air-water interface. In this paper, an air layer was maintained experimentally by continuous air injection on hydrophobic surfaces. Good hydrophobicity was found to benefit the spread of air bubbles and the formation of a wide and flat air layer on solid surfaces. Based on this recognition, a method combining air injection and surface hydrophobicity adjustment was proposed to maintain the air layer. Through flow field analyses, it has been found that the roughness of irregular micro-structures on superhydrophobic surfaces became dominant and the frictional drag was increased in the Wenzel state. However through air injection, the Cassie state was able to be recovered and the slip could also be re-formed at the solid surface. Because of the slip effect, vortices and shears in the turbulent boundary layer were restrained, and a drag reduction up to 20% was obtained in the study. This method was promising to maintain a robust air-water interface on superhydrophobic surfaces and sustain the drag reduction effect in engineering applications. |
Keyword | Superhydrophobic Surface Slip Drag Reduction Air-water Interface |
Subject Area | 材料科学与物理化学 |
DOI | 10.1016/j.oceaneng.2016.11.028 |
Funding Organization | National Natural Science Foundation of China (Grant No. 51679203;51335010);Fundamental Research Funds for the Central Universities (Grant No. 3102015ZY017);Natural Science Basic Research Plan in Shaanxi Province of China (Grant No. 2016JM1002);the Seed Foundation of Innovation and Creation for Graduate Students in NWPU (Grant No. Z2016055);Natural Science Basic Research Plan in Shenzhen City of China (Grant No. JCYJ20160510140747996) |
Indexed By | SCI |
If | 1.894 |
Language | 英语 |
Funding Project | 复合润滑材料组 |
compositor | 第三作者单位 |
Citation statistics | |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/21431 |
Collection | 中国科学院材料磨损与防护重点实验室/先进润滑与防护材料研究发展中心 固体润滑国家重点实验室(LSL) |
Corresponding Author | Song, Dong; Hu, Haibao |
Affiliation | 1.Northwestern Polytech Univ, Sch Marine Sci & Technol, Xian 710072, Peoples R China 2.Univ Technol Compiegne, Sorbonne Univ, Lab Roberval, UMR CNRS Ctr Rech Royallieu CS 7337, F-60319 Compiegne, France 3.Chinese Acad Sci, Lanzhou Inst Chem Phys, Lanzhou 730000, Peoples R China |
Recommended Citation GB/T 7714 | Du, Peng,Wen, Jun,Zhang ZZ,et al. Maintenance of air layer and drag reduction on superhydrophobic surface[J]. Ocean Engineering,2017,130:328-335. |
APA | Du, Peng,Wen, Jun,Zhang ZZ,Song, Dong,A. Ouahsine,&Hu, Haibao.(2017).Maintenance of air layer and drag reduction on superhydrophobic surface.Ocean Engineering,130,328-335. |
MLA | Du, Peng,et al."Maintenance of air layer and drag reduction on superhydrophobic surface".Ocean Engineering 130(2017):328-335. |
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