TRPIV measurement of turbulent coherent structures in a drag-reducing flow by polymers

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	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)
刊名	THEORETICAL & APPLIED MECHANICS LETTERS
	2013-07-10
通讯作者邮箱	nanj@tju.edu.cn
卷号	3 期号:4 页码:8-042006
关键词	spatial topology of coherent structures turbulent drag-reducing flow polymer additives TRPIV
ISSN号	2095-0349
通讯作者	姜楠
产权排序	[Guan, Xinlei1;Jiang, Nan 1,2,3,4; Cheng, Lu 1;Zhang, Hao1 ] 1. Department of Mechanics, Tianjin University, Tianjin 300072, China; 2. Tianjin Key Laboratory of Modern Engineering Mechanics, Tianjin 300072, China; 3. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China; 4. Nankai University{Tianjin University Center for LiuHui Applied Mathematics Tianjin 300072, China
合作状况	国内
中文摘要	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.
学科主题	湍流 ; 实验流体力学
分类号	二类
原文出处	http://dx.doi.org/10.1063/2.1304206
语种	英语
公开日期	2013-12-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/47605]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Jiang N(姜楠)
推荐引用方式 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.