Mechanism for vorticity in a secondary flow within a pipe: Vortex-induced vortex | |
Lin LM(林黎明)1; Wu YX(吴应湘)1,2 | |
发表期刊 | PHYSICS OF FLUIDS |
2020-03-01 | |
卷号 | 32期号:3页码:13 |
ISSN | 1070-6631 |
摘要 | Vortex-induced vortex theory, commonly used for a flow past a disturbed bluff body, is applied in this paper to analyze an incompressible flow through a circular-section pipe with the occurrence of a secondary flow. The disturbed flow field is solved based on the Stokes equations by introducing a vortex or vortex pair uniformly distributed along the axial direction and periodically varying along the azimuthal direction as a result of the secondary flow with the assumption of inertial force being neglected and the viscous force being dominant in the vicinity of the pipe walls. Two kinds of boundary cases are considered to simulate the introduced vorticity distributed on and near the walls, and two sign laws for vorticity are also derived and verified for the present internal flow. For original pipe flow with a specific velocity distribution, such as a paraboloid of revolution at lower Reynolds numbers, these two sign laws are all positive upstream but negative downstream and they physically reveal the intrinsic relationships of the vorticity sign among different vorticity components, which are generated inherently with specific signs in secondary flows. Furthermore, two basic viscous force mechanisms are identified: a direct effect for vorticity generated on the walls due to shear flows and an indirect effect for vorticity induced by a vortex with former vorticity near the walls. Examples to demonstrate these two sign laws under geometric disturbances at a laminar Reynolds number of 200 and physical meaning are also presented briefly. |
DOI | 10.1063/1.5128414 |
收录类别 | SCI ; EI |
语种 | 英语 |
WOS记录号 | WOS:000519110800002 |
关键词[WOS] | BOUNDARY-LAYER ; PHASE ; SIGN |
WOS研究方向 | Mechanics ; Physics |
WOS类目 | Mechanics ; Physics, Fluids & Plasmas |
资助项目 | Strategic Priority Research Program of the Chinese Academy of Science[XDB22030101] |
项目资助者 | Strategic Priority Research Program of the Chinese Academy of Science |
论文分区 | 一类/力学重要期刊 |
力学所作者排名 | 1 |
RpAuthor | 林黎明 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://dspace.imech.ac.cn/handle/311007/81802 |
专题 | 流固耦合系统力学重点实验室 |
通讯作者 | Lin LM(林黎明) |
作者单位 | 1.Chinese Acad Sci, Inst Mech, Key Lab Mech Fluid Solid Coupling Syst, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Sch Engn Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Lin LM,Wu YX. Mechanism for vorticity in a secondary flow within a pipe: Vortex-induced vortex[J]. PHYSICS OF FLUIDS,2020,32,3,:13. |
APA | Lin LM,&Wu YX.(2020).Mechanism for vorticity in a secondary flow within a pipe: Vortex-induced vortex.PHYSICS OF FLUIDS,32(3),13. |
MLA | Lin LM,et al."Mechanism for vorticity in a secondary flow within a pipe: Vortex-induced vortex".PHYSICS OF FLUIDS 32.3(2020):13. |
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