Results 201 to 210 of about 8,471 (240)
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Yaw Angle Effects on Optimized Riblets
2001The drag reducing effect of riblets, has been demonstrated previously both experimentally and theoretically. Several aspects of the application of riblet film on an long range aircraft are considered. The aim of the present investigation is to check experimentally the effects of an angle of yaw on the performance of riblets.
Hage, W., Bechert, D. W., Bruse, M.
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, 2020
In the work presented in this paper, a section of convergent-divergent (C-D) riblets is applied upstream of a backward-facing rounded ramp in a fully developed laminar channel flow at a Reynolds number based on the channel height of 400.
Tongbiao Guo, S. Zhong, T. Craft
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In the work presented in this paper, a section of convergent-divergent (C-D) riblets is applied upstream of a backward-facing rounded ramp in a fully developed laminar channel flow at a Reynolds number based on the channel height of 400.
Tongbiao Guo, S. Zhong, T. Craft
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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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Riblet Surfaces for Improvement of Efficiency of Wind Turbines
, 2020Energy e ciency remains a major challenge for many industrial sectors. Micro-structured surfaces (socalled riblet surfaces or ‘shark-skin’) reduce the frictional resistance of at surfaces by up to 10%.
P. Leitl +7 more
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Smart Flow Control with Riblets
Advanced Materials Research, 2013A review of riblets as a smart flow control device is given. After the state-of-the-art examination of the drag reduction performance, different views on the drag reduction mechanism are put in perspective. Being a smart flow control device, riblets can control not only momentum, but also heat and flow noise.
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Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2020
Riblet is one of the most promising passive drag reduction techniques in turbulent flows. In this paper, hot-wire measurements on a turbulent boundary layer perturbed by a drag-reducing riblet surface are carried out to further understand the riblet ...
Ziliang Zhang +3 more
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Riblet is one of the most promising passive drag reduction techniques in turbulent flows. In this paper, hot-wire measurements on a turbulent boundary layer perturbed by a drag-reducing riblet surface are carried out to further understand the riblet ...
Ziliang Zhang +3 more
semanticscholar +1 more source
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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Heat transfer study of riblets
1991A wind tunnel study of the heat-transfer characteristics of surfaces with triangular profile riblets has been carried out in a two-dimensional turbulent boundary layer and the results compared with those of a smooth surface. The heat-transfer coefficient has been measured for the Reynolds number of 2.8 to 11.3×105 based on the streamwise length ...
K.-S. Choi, S. Hamid
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Turbulent Drag Reduction by Oscillating Riblets
4th Flow Control Conference, 2008A novel approach using laterally oscillating riblets is investigated to reduce the turbulent drag of wall-bounded flows. The new method is intended to combine the eect of the wellknown stationary riblets with the strong eect of lateral wall-oscillations.
Wassen, E. +5 more
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Drag reducing riblets on nektar++
2022Riblets, inspired from the ribbed texture of shark-skins have the potential to reduce turbulent skin-friction drag. Riblets are attractive due to its nature as a passive flow control device which requires no energy input to alter the flow favourably. An optimally designed riblet can achieve a skin-friction drag reduction of up to ∼ 10%, which can be ...
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