Abstract
The fact that riblets do reduce shear-stress has been established for more than ten years beyond any reasonable doubt. A plausible explanation is, that the longitudinal ribs rectify the turbulent flow in mean flow direction by hampering the fluctuating cross-flow velocity component w’. In a turbulent boundary layer the cross-flow w’ and the flow component normal to the wall v’ are connected through the low-speed-streaks and burst phenomena. If the cross-flow fluctuation w’ close to the wall can be reduced, the turbulent momentum transfer close to the surface will be reduced as well and consequently, the shear stress \( - \rho \cdot (\overline {u'v'} ) \) will be decreased.
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References
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© 1998 Springer Science+Business Media Dordrecht
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Bruse, M., Bechert, D.W., Hage, W. (1998). Using the Hot-Film Technique for Velocity Measurements over a Riblet Structured Surface. In: Frisch, U. (eds) Advances in Turbulence VII. Fluid Mechanics and Its Applications, vol 46. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5118-4_5
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DOI: https://doi.org/10.1007/978-94-011-5118-4_5
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