Some characteristics of low-speed streaks under sheared air-water interfaces

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	Some characteristics of low-speed streaks under sheared air-water interfaces
	Wang SF(王双峰); Jia F(贾复)
刊名	Acta Mechanica Sinica
	2001
卷号	17 期号:2 页码:115-124
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 characteristics of low-speed fluid streaks occurring under sheared air-water interfaces were examined by means of hydrogen bubble visualization technique. A critical shear condition under which the streaky structure first appears was determined to be u(tau) approximate to 0.19 cm/s. The mean spanwise streak spacing increases with distance from the water surface owing to merging and bursting processes, and a linear relationship describing variation of non-dimensional spacing <(+)over bar> versus y(+) was found essentially independent of shear stress on the interface. Values of <(+)over bar>, however, are remarkably smaller than their counterparts in the near-wall region of turbulent boundary layers. Though low-speed streaks occur randomly in time and space, the streak spacing exhibits a lognormal probability distribution behavior. A tentative explanation concerning the formation of streaky structure is suggested, and the fact that <(+)over bar> takes rather smaller values than that in wall turbulence is briefly discussed.
学科主题	力学
类目[WOS]	Engineering, Mechanical ; Mechanics
研究领域[WOS]	Engineering ; Mechanics
关键词[WOS]	TURBULENT BOUNDARY-LAYER ; CHANNEL FLOW ; FREE-SURFACE
收录类别	SCI ; EI ; CSCD
语种	英语
WOS记录号	WOS:000168986700002
公开日期	2007-06-15
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/16143]
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. Some characteristics of low-speed streaks under sheared air-water interfaces[J]. Acta Mechanica Sinica,2001,17(2):115-124.
APA	王双峰,&贾复.(2001).Some characteristics of low-speed streaks under sheared air-water interfaces.Acta Mechanica Sinica,17(2),115-124.
MLA	王双峰,et al."Some characteristics of low-speed streaks under sheared air-water interfaces".Acta Mechanica Sinica 17.2(2001):115-124.