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 burst and sweep 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 \( - p \cdot (\overline {u'v'} ) \) will be decreased
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© 1999 Springer Science+Business Media Dordrecht
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Bruse, M., Bechert, D.W., Hage, W. (1999). The Flow Over Riblets: Velocity Measurements with Hot-Film Probes. In: Meier, G.E.A., Viswanath, P.R. (eds) IUTAM Symposium on Mechanics of Passive and Active Flow Control. Fluid Mechanics and its Applications, vol 53. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4199-4_19
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DOI: https://doi.org/10.1007/978-94-011-4199-4_19
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