Results 181 to 190 of about 1,940 (222)
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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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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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Development of the wake of an airfoil with riblets
AIAA Journal, 1992Tests were conducted on a NACA 0012 airfoil with riblets at a freestream Reynolds number of 2.5 x 105 in an indraft wind tunnel. The riblets used in the investigation were of symmetric v-groove type with the heights of 0.0229, 0.076, and 0.152 mm.
J. M. Caram, A. Ahmed
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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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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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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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Properties of riblets at supersonic speed
Applied Scientific Research, 1989The properties of a riblet surface at a Mach number of 1.25 are described. Direct measurement has been made of the surface shear stress on a riblet surface attached to a skin-friction balance mounted beneath the turbulent boundary layer growing along a wall of the RAE 2 ft×1 1/2 ft variable density transonic wind tunnel.
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Effects of contamination on riblet performance
Journal of Aircraft, 1989Thin-element polymeric film riblet surfacing materials previously shown to behave similarly to v-groove riblets in the reduction of aerodynamic drag have been tested to ascertain the effects of groove contamination. Three different levels of contamination were simulated for each of two kinds of contamination.
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The optimization of biomimetic sharkskin riblet for the adaptation of drag reduction
Ocean Engineering, 2023Liguo Qin +2 more
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