Abstract
Direct shear stress measurements were carried out on a riblet test plate with rectangular riblet grooves in a fully turbulent oil channel flow. The band-shaped riblets were tilted in spanwise direction by means of an electric drive up to an amplitude of 30° and a frequency of 4 Hz. Those oscillating riblets were intended to combine the drag reducing effect of conventional, stationary riblets with that of a laterally oscillating wall. Shear stress measurements on oscillating riblets with a cross-section optimal for stationary riblets yielded improvements in the drag-reducing capability of order of the measurement accuracy. For elongated riblets, a measurable increase in the drag reduction was obtained at certain values of the dimensionless oscillation period. Those results are in qualitative congruence to results from DNS simulations previously published.However, the maximum drag reduction of stationary riblets could not be increased by oscillating riblets. By 3D-PIV measurements, the successful generation of an additional spanwise velocity component in the near-wall region was proven.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Bechert, D.W., Hoppe, G., van der Hoeven, J.G.T., Makris, R.: The Berlin oil channel for drag reduction research. Exp. Fluids 12, 251–260 (1992)
Bechert, D.W., Bruse, M., Hage, W., van der Hoeven, J.G.T., Hoppe, G.: Experiments on drag-reducing surfaces and their optimization with an adjustable geometry. J. Fluid Mech. 338, 59–87 (1997)
Choi, J.-I., Xu, C.-X., Sung, H.-J.: Drag Reduction by Spanwise Wall Oscillation in Wall-Bounded Turbulent Flows. AIAA Journal 40(5) (2002)
Grüneberger, R., Hage, W.: Drag characteristics of longitudinal and transverse riblets at low dimensionless spacings. Exp. Fluids 50, 363–373 (2010)
Jung, W.J., Mangiavacchi, N., Akhavan, R.: Suppression of turbulence in wall-bounded flows by high-frequency spanwise oscillations. Phys. Fluids A 4(8), 1605–1607 (1992)
Kim, J., Hussain, F.: Propagation velocity of perturbations in turbulent channel flow. Phys. Fluids A 5(3), 695–703 (1993)
Quadrio, M., Ricco, P.: Critical assessment of turbulent drag reduction trough spanwise wall oscillations. J. Fluid Mech. 521, 251–271 (2004)
Walsh, M.J.: Turbulent boundary layer drag reduction using riblets, AIAA paper 82-0169 (1982)
Wassen, E., Kramer, F., Thiele, F., Grüneberger, R., Hage, W., Meyer, R.: Turbulent Drag Reduction by Oscillating Riblets, AIAA paper 2008-4204 (2008)
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2013 Springer-Verlag Berlin Heidelberg
About this chapter
Cite this chapter
Grüneberger, R., Kramer, F., Hage, W., Meyer, R., Thiele, F., Wassen, E. (2013). Experimental Investigation of Oscillating Riblets for Turbulent Drag Reduction. In: Dillmann, A., Heller, G., Kreplin, HP., Nitsche, W., Peltzer, I. (eds) New Results in Numerical and Experimental Fluid Mechanics VIII. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 121. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35680-3_24
Download citation
DOI: https://doi.org/10.1007/978-3-642-35680-3_24
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-35679-7
Online ISBN: 978-3-642-35680-3
eBook Packages: EngineeringEngineering (R0)