In-situ Grafting Hydrophilic Polymeric Layer for Stable Drag Reduction | |
Department | 固体润滑国家重点实验室 |
Tian CG(田超国); Wang XW(王行伟); Liu Y(刘莹); Yang WF(杨武芳); Hu HB(胡海豹); Pei XW(裴小维); Zhou F(周峰) | |
The second department | 材料表面与界面行为研究课题组(208)) |
2019-05-14 | |
Source Publication | Langmuir |
Issue | 35Pages:7205−7211 |
Abstract | Developing drag reduction techniques has attracted great attention because of their need in practical applications. However, many of the proposed strategies exhibit some inevitable limitations, especially for long period of adhibition. In this work, the dynamic but stable drag reduction effect of superhydrophilic hydrogel-coated iron sphere falling freely in a cylindrical water tank was investigated. The absolute instantaneous velocities and displacements of either the hydrogel-encapsulated or unmodified iron sphere falling freely in water were monitored via a high-speed video. It was revealed that, in the range of Reynolds number from 104 to 106 , the optimized hydrogel-coated iron sphere with uniform stability could reduce the resistance by up to 40%, which was mainly due to the boundary slip of water and the delayed boundary separation that resulted from the coated hydrogel. Besides, the deliberate experiments and analysis further indicated that the superhydrophilic hydrogel layer accompanied by the emergence of the drag crisis has largely effected the distribution of flow field at the boundary around the sphere. More importantly, the drag reduction behavior based on the proposed method was thermodynamically stable and resistant to external stimulus, including fluidic oscillator and hydrodynamic pressure. The effective long-term drag reduction performance of the hydrophilic substrate can be expected, correspondingly, and also provides a novel preliminary protocol and avenues for the development of durable drag reduction technologies. |
Indexed By | SCI |
If | 3.75 |
Language | 英语 |
compositor | 第三作者单位 |
Document Type | 期刊论文 |
Identifier | http://ir.licp.cn/handle/362003/26099 |
Collection | 固体润滑国家重点实验室(LSL) |
Corresponding Author | Tian CG(田超国); Yang WF(杨武芳); Hu HB(胡海豹) |
Affiliation | 1.School of Mechatronics Engineering, Nanchang University 2.School of Materials and School of Marine Science and Technology, Northwestern Polytechnical University 3.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences |
Recommended Citation GB/T 7714 | Tian CG,Wang XW,Liu Y,et al. In-situ Grafting Hydrophilic Polymeric Layer for Stable Drag Reduction[J]. Langmuir,2019(35):7205−7211. |
APA | Tian CG.,Wang XW.,Liu Y.,Yang WF.,Hu HB.,...&Zhou F.(2019).In-situ Grafting Hydrophilic Polymeric Layer for Stable Drag Reduction.Langmuir(35),7205−7211. |
MLA | Tian CG,et al."In-situ Grafting Hydrophilic Polymeric Layer for Stable Drag Reduction".Langmuir .35(2019):7205−7211. |
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In Situ Grafting Hyd(4246KB) | 期刊论文 | 作者接受稿 | 开放获取 | CC BY-NC-SA | View Application Full Text |
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