An experimental study on turbulent coherent structures near a sheared air-water interface

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	An experimental study on turbulent coherent structures near a sheared air-water interface
	Wang SF(王双峰); Jia F(贾复); Niu ZN(钮珍南); Wu ZZ(吴彰植)
刊名	Acta Mechanica Sinica
	1999
卷号	15 期号:4 页码:289-298
ISSN号	0567-7718
通讯作者	Wang, SF (reprint author), Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China.
中文摘要	The turbulence structures near a sheared air-water interface were experimentally investigated with the hydrogen bubble visualization technique. Surface shear was imposed by an airflow over the water flow which was kept free from surface waves. Results show that the wind shear has the main influence on coherent structures under air-water interfaces. Low- and high- speed streaks form in the region close to the interface as a result of the imposed shear stress. When a certain airflow velocity is reached, "turbulent spots" appear randomly at low-speed streaks with some characteristics of hairpin vortices. At even higher shear rates, the flow near the interface is dominated primarily by intermittent bursting events. The coherent structures observed neat sheared air-water interfaces show qualitative similarities with those occurring in near-wall turbulence. However, a few distinctive phenomena were also observed, including the fluctuating thickness of the instantaneous boundary layer and vertical vortices in bursting processes, which appear to be associated with the characteristics of air-water interfaces.
学科主题	力学
类目[WOS]	Engineering, Mechanical ; Mechanics
研究领域[WOS]	Engineering ; Mechanics
关键词[WOS]	OPEN-CHANNEL FLOW ; SURFACE TURBULENCE ; BOUNDARY-LAYER ; WALL
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000087217100001
公开日期	2007-06-15 ; 2007-12-05 ; 2009-06-23
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/15849]
专题	力学研究所_力学所知识产出(1956-2008)
推荐引用方式 GB/T 7714	Wang SF,Jia F,Niu ZN,et al. An experimental study on turbulent coherent structures near a sheared air-water interface[J]. Acta Mechanica Sinica,1999,15(4):289-298.
APA	王双峰,贾复,钮珍南,&吴彰植.(1999).An experimental study on turbulent coherent structures near a sheared air-water interface.Acta Mechanica Sinica,15(4),289-298.
MLA	王双峰,et al."An experimental study on turbulent coherent structures near a sheared air-water interface".Acta Mechanica Sinica 15.4(1999):289-298.