Riblet drag reduction
WebbRiblet films are a passive method of turbulent boundary layer control that can reduce viscous drag. They have been studied with great detail for over 30 years. Although common riblet applications include flows with Adverse Pressure Gradients (APG), nearly all research thus far has been performed in channel flows. Webb13 apr. 2011 · Benschop H and Breugem W (2024) Drag reduction by herringbone riblet texture in direct numerical simulations of turbulent channel flow, Journal of Turbulence, 10.1080/14685248.2024.1319951, 18:8, (717-759), Online publication date: 3-Aug-2024.
Riblet drag reduction
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Webb5 feb. 2024 · Model-based design of riblets for turbulent drag reduction. Wei Ran, Armin Zare, Mihailo R. Jovanović. Both experiments and direct numerical simulations have … WebbRevealing the turbulent drag reduction mechanism of water flow on microstructured surfaces is beneficial to controlling and using this technology to reduce turbulence ... was higher compared with the riblet surface (RS), while the Reynolds shear stress was small. The vortices on microstructured surfaces were weakened within 0.2 times that of ...
Webb13 dec. 2024 · Novel bioinspired asymmetric triangular riblet surfaces have been shown to exhibit vortex drag reduction and a delayed transition to turbulence through numerical simulations. Optimal dimensions are largely dependent on the flow conditions and past studies proposed that drag reduction performance increases with Reynolds number with … WebbFor this purpose, various riblet geometries were tested experimentally. With an increasing misalignment to the flow direction the drag reduction ability of the riblets deteriorates. This effect is related to the geometry of the riblets, e.g., a riblet geometry with trapezoidal grooves and a tip angle of the ribs of α = 45° is less affected by ...
Webb20 feb. 2024 · Drag reduction (DR) and antifouling have been plaguing various industries. For instance, over 50% of fuel consumption in ships is attributed to surface drag. (1) Moreover, the surface fouling on the underwater ships is also severe and inevitable, usually intensifying the drag. WebbPauly (2001) developed a riblet-covered pump with increased efficiency and a drag reduction of nearly 7%. In 2008, a hot-pressing method was proposed for fabricating …
Webb8 apr. 2024 · riblet drag reduction effect were performed by Walsh. 18,19. It was. found that drag reduction could be obtaine d when the height of the. riblet structure expressed in wall units, s ...
WebbKeywords: Turbulence, drag reduction, riblets, boundary layers, skin friction . Introduction: In recent years, turbulent boundary layer drag reduction has become an important area of fluid dynamics research. Specifically, rising fuel costs greatly emphasized the usefulness and necessity of developing efficient viscous drag reduction methods. is the equality act lawWebb12 maj 2015 · A Taylor–Couette facility was used to measure the drag reduction of a riblet surface on the inner cylinder. The drag on the surfaces of the inner and outer cylinders is determined from the measured torque when the cylinders are in exact counter-rotation. The three velocity components in the instantaneous flow field were obtained by tomographic … is the equalizer being renewed for season 3Webb13 dec. 2024 · The drag reduction effect of the non-smooth pipe with riblet C2 was clearly superior to that with riblet C1, with the maximum drag reduction gained with riblet C2 at Re = 40,459 (s + = 18.9737). We can state that the optimum drag reduction s + was not less than 18.9737, but we could determine the exact value. i grew up in hendon