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- Publisher
- Springer Journals
- Copyright
- 2001 Chinese Society of Theoretical and Applied Mechanics
- ISSN
- 0567-7718
- eISSN
- 1614-3116
- DOI
- 10.1007/BF02487599
- Publisher site
- See Article on Publisher Site
Abstract
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 beu τ≈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\(\overline {\lambda ^ + } \) versusy + was found essentially independent of shear stress on the interface. Values of\(\overline {\lambda ^ + } \), 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\(\overline {\lambda ^ + } \) takes rather smaller values than that in wall turbulence is briefly discussed.
Journal
"Acta Mechanica Sinica" – Springer Journals
Published: May 1, 2001