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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)
Source PublicationTHEORETICAL & APPLIED MECHANICS LETTERS
2013-07-10
Volume3Issue:4Pages:8-042006
ISSN2095-0349
AbstractFully 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.
KeywordSpatial 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
Identifierhttp://dspace.imech.ac.cn/handle/311007/47605
Collection非线性力学国家重点实验室
Corresponding AuthorJiang 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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