| TRPIV measurement of turbulent coherent structures in a drag-reducing flow by polymers | |
Guan XL; Jiang N(姜楠) ; Cheng L; Zhang H; Jiang N(姜楠)
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| Source Publication | THEORETICAL & APPLIED MECHANICS LETTERS
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| 2013-07-10 | |
| Volume | 3Issue:4Pages:8-042006 |
| ISSN | 2095-0349 |
| Abstract | Fully developed turbulent flow fields with and without polymer solution at the same Reynolds number were measured by time-resolved particle image velocimetry (TRPIV) in a water channel to investigate the mechanism of drag-reducing solution from the view of coherent structures manipulation. The streamwise mean velocity and Reynolds stress profiles in the solution were compared with those in water. After adding the polymer solution, the Reynolds stress in the near-wall area decreases significantly. The result relates tightly to the decease of the coherent structures’ bursting. The spatial topology of coherent structures during bursts has been extracted by the new mu-level criterion based on locally averaged velocity structure function. The effect of polymers on turbulent coherent structures mainly reflects in the intensity, not in the shape. In the solution, it is by suppressing the coherent structures that the wall friction is reduced. |
| Keyword | Spatial Topology Of Coherent Structures Turbulent Drag-reducing Flow Polymer Additives Trpiv |
| Subject Area | 湍流 ; 实验流体力学 |
| URL | 查看原文 |
| Language | 英语 |
| Classification | 二类 |
| Document Type | 期刊论文 |
| Identifier | http://dspace.imech.ac.cn/handle/311007/47605 |
| Collection | 非线性力学国家重点实验室 |
| Corresponding Author | Jiang N(姜楠) |
| Recommended Citation GB/T 7714 | Guan XL,Jiang N,Cheng L,et al. TRPIV measurement of turbulent coherent structures in a drag-reducing flow by polymers[J]. THEORETICAL & APPLIED MECHANICS LETTERS,2013,3,4,:8-042006. |
| APA | Guan XL,Jiang N,Cheng L,Zhang H,&姜楠.(2013).TRPIV measurement of turbulent coherent structures in a drag-reducing flow by polymers.THEORETICAL & APPLIED MECHANICS LETTERS,3(4),8-042006. |
| MLA | Guan XL,et al."TRPIV measurement of turbulent coherent structures in a drag-reducing flow by polymers".THEORETICAL & APPLIED MECHANICS LETTERS 3.4(2013):8-042006. |
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| IMCAS-J2013-331.pdf（2098KB） | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | View Download | |
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