Results 81 to 90 of about 177 (133)
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AIP Conference Proceedings, 2020
The effectiveness of riblets in reducing friction drag has been well assessed by many experiments in flat plate flow in the end of the last century. Both theory and experiments showed that the effect of riblets only depends on the local Reynolds number, however some experiments in pressure gradient flow showed increased effectiveness of riblets.
Mele B., Tognaccini R.
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The effectiveness of riblets in reducing friction drag has been well assessed by many experiments in flat plate flow in the end of the last century. Both theory and experiments showed that the effect of riblets only depends on the local Reynolds number, however some experiments in pressure gradient flow showed increased effectiveness of riblets.
Mele B., Tognaccini R.
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Numerical investigation of V-shaped riblets and an improved model of riblet effects
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2017Symmetric V-shaped riblets are simulated by using the computational fluid dynamic method to understand the riblet effects on the turbulent boundary layer and the skin friction reduction. Three classical turbulence models, namely Spalart–Allmaras, shear stress transport, and re-normalization group k-epsilon models, are investigated under different grid ...
Yu Yang, Zhang Ming-Ming, Li Xue-Song
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Coherent structures and riblets
Applied Scientific Research, 1995We study the effect of the riblets on the coherent structures near the wall. The emphasis is put on the genesis of the quasi-streamwise vortices in the presence of the riblets. The quasi-streamwise vortices regenerate by the tilting of wall normal vorticity induced by prevailing structures. This requires a mechanism which leads to a temporal streamwise
Tardu, Sedat F., Tardu, Sedat, F.
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Flow, Turbulence and Combustion, 1998
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The effect of riblets on sails
Experiments in Fluids, 1995This paper describes an experimental investigation into the effect of riblets on the aerodynamic forces generated by sails. Riblets are known to reduce the viscous drag on flat surfaces and on airfoils, but their effect on the drag — or on the lift — of a highly three-dimensional, very thin lifting surface such as a sail is unknown.
A. E. Alving, P. Freeberg
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Drag Reduction in Pipes Lined with Riblets
AIAA Journal, 1990In the present paper, experiments are reported establishing a maximum drag reduction of five to seven percent in fully developed turbulent flow of water through 25.4mm and 50.8mm diameter pipes lined with a film of grooved equilateral triangles of base 0.11mm. The maximum reduction occurs when the height of the riblets is 11 to 16 wall units.
K. N. Liu +3 more
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1989
Riblets are little groves dug on the surface of flying or swimming solid bodies in order to reduce their drag. Why riblets work is not known but it is believed that it is a turbulent process because they trap the main eddies that develop near the solid body surfaces.
O. Pironneau, G. Arumugam
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Riblets are little groves dug on the surface of flying or swimming solid bodies in order to reduce their drag. Why riblets work is not known but it is believed that it is a turbulent process because they trap the main eddies that develop near the solid body surfaces.
O. Pironneau, G. Arumugam
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Grinding of Riblets on Curved Paths
Materials Science Forum, 2016The grinding of riblets with multiple profiled grinding wheels is an efficient method to minimize the fluid friction on surfaces. In turbo machinery components, like pump impellers or compressor blades, the riblets must be ground with a curved tool path since the flow is rarely linear on such surfaces.
Berend Denkena, Thilo Grove, Jan Harmes
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Drag Reduction With Superhydrophobic Riblets
Volume 8: Mechanics of Solids, Structures and Fluids, 2012Samples combining riblets and superhydrophobic surfaces are fabricated at University of Pittsburgh and their drag reduction properties are studied at the Center for Nanophase Materials Sciences (CNMS) in Oak Ridge National Laboratory with a commercial cone-and-plate rheometer. In parallel to the experiments, numerical simulations are performed in order
Charlotte Barbier +2 more
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On Riblet's Theorem (Correspondence)
IEEE Transactions on Microwave Theory and Techniques, 1958Riblet presented the following theorem which is concerned with the synthesis of a quarter-wave impedance transformer.
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