Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales.
Experimental investigations on drag-reduction characteristics of bionic surface with water-trapping microstructures of fish scales.
复制标题
DOI：
10.1038/s41598-018-30490-x
复制
发表时间：
2018-08-15
影响因子：
4.6
通讯作者：
Yan Y
中科院分区：
文献类型：
--
作者：
Wu L;Jiao Z;Song Y;Liu C;Wang H;Yan Y
自然界中具有独特润湿性的生物表面为科学家和工程师提供了巨大的创新。更具体地说，具有各种润湿性能的材料由于其广阔的应用前景而引起了广泛的关注。近年来，受生物学启发的润湿减阻材料因其节能的能力而受到人们的大力研究。本工作采用实验方法探讨了草鱼鳞片精细滞水微结构仿生表面的减阻特性。首先，通过运行阻力测试系统仔细测试了光滑表面和仿生表面实验样品在不同速度下的阻力。然后，利用接触角测量仪测量鱼鳞表面的接触角(CA)。结果发现，仿生表面在低速时产生了良好的减阻效果，且减阻率随着流速的增加显着呈现下降趋势。由此可见，当流速为0.66米/秒时，减阻效果最佳，最大减阻率为2.805%，与模拟结果一致。此外，鱼鳞表面的接触角（CA）为11.5°，表现出良好的亲水性。进一步体现了鱼鳞顶端区域的铺展润湿现象和较高的表面能，对减阻性能起到了重要作用。这项工作将在工程和交通领域具有巨大的潜力。
Biological surfaces with unique wettability in nature have provided an enormous innovation for scientists and engineers. More specifically, materials possessing various wetting properties have drawn considerable attention owing to their promising application prospects. Recently, great efforts have been concentrated on the researches on wetting-induced drag-reduction materials inspired by biology because of their ability to save energy. In this work, the drag-reduction characteristics of the bionic surface with delicate water-trapping microstructures of fish Ctenopharyngodon idellus scales were explored by experimental method. Firstly, the resistance of smooth surface and bionic surface experimental sample at different speeds was carefully tested through the testing system for operation resistance. Then, the contact angle (CA) of fish scale surface was measured by means of the contact angle measuring instrument. It was discovered that the bionic surface created a rewarding drag-reduction effect at a low speed, and the drag-reduction rate significantly displayed a downward trend with the increase in flow speed. Thus, when the rate was 0.66 m/s, the drag-reduction effect was at the optimum level, and the maximum drag reduction rate was 2.805%, which was in concordance with the simulated one. Furthermore, a contact angle (CA) of 11.5° appeared on the fish scale surface, exhibiting fine hydrophilic property. It further manifested the spreading-wetting phenomenon and the higher surface energy for the area of apical of fish scales, which played an important role in drag-reduction performance. This work will have a great potential in the engineering and transportation field.
登录
查看更多内容
影响因子：
0.8
作者：
Fish, Frank E.;Weber, Paul W.;Howle, Laurens E.
通讯作者：
Howle, Laurens E.
影响因子：
2.5
作者：
Luo Yuehao;Wang Liguo;Smith, Robert
通讯作者：
Smith, Robert
影响因子：
4.6
作者：
Bandyopadhyay PR;Hellum AM
通讯作者：
Hellum AM
影响因子：
9.9
作者：
Bixler, Gregory D.;Bhushan, Bharat
通讯作者：
Bhushan, Bharat
影响因子：
18.9
作者：
Gong, Wei;Zu, Yingqing;Yan, Yuying
通讯作者：
Yan, Yuying