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)
发表期刊	THEORETICAL & APPLIED MECHANICS LETTERS
	2013-07-10
卷号	3 期号:4 页码:8-042006
ISSN	2095-0349
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.
关键词	Spatial Topology Of Coherent Structures Turbulent Drag-reducing Flow Polymer Additives Trpiv
学科领域	湍流 ; 实验流体力学
URL	查看原文
语种	英语
论文分区	二类
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/47605
专题	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.

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