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Titolo:
Some characteristics of low-speed streaks under sheared air-water interfaces
Autore:
Wang, SF; Jia, F;
Indirizzi:
Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China Chinese Acad Sci Beijing Peoples R China 100080 100080, Peoples R China
Titolo Testata:
ACTA MECHANICA SINICA
fascicolo: 2, volume: 17, anno: 2001,
pagine: 115 - 124
SICI:
0567-7718(200105)17:2<115:SCOLSU>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
TURBULENT BOUNDARY-LAYER; CHANNEL FLOW; FREE-SURFACE;
Keywords:
air-water interface; low-speed streak; turbulent coherent structure; flow visualization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Wang, SF Chinese Acad Sci, Inst Mech, Beijing 100080, Peoples R China Chinese Acad Sci Beijing Peoples R China 100080 Peoples R China
Citazione:
S.F. Wang e F. Jia, "Some characteristics of low-speed streaks under sheared air-water interfaces", ACT MEC SIN, 17(2), 2001, pp. 115-124

Abstract

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 <(<lambda>+)over bar> versus y(+) was found essentially independent of shear stress on the interface. Values of <(<lambda>+)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 <(<lambda>)over bar> takes rather smaller values than that in wall turbulence is briefly discussed.

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Documento generato il 02/04/20 alle ore 17:05:55