Drag reducing surface fabrication with deformed sharkskin morphology

Luo, Yue; Li, X.; Zhang, D. Y.; Liu, Y. F.

doi:10.1179/1743294415y.0000000037

Cited by 14 publications

(8 citation statements)

References 23 publications

(23 reference statements)

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“…(a) Superhydrophobicity can possess an air barrier layer underwater like Salvinia and Notonecta glauca . , (b) Superhydrophilicity tends to attract water to form a water layer or achieve a continuous supply water barrier layer through fluid transport ( Sarracenia trichome ) whose hierarchical microchannel organization of the trichome facilitates the ultrafast water transport . (c) Lubricant can be achieved after external stimuli or constantly secrete like earthworms and sharks. , Reproduced with permission from ref , copyright 2010 Wiley; ref , copyright 2011 Beilstein-Institut; ref , copyright 2015 American Chemical Society; ref , copyright 2009 Wiley; ref , copyright 2017 Springer Nature; ref , copyright 2018 Wiley; and ref , copyright 2016 Taylor & Francis.…”

Section: Discussionmentioning

confidence: 99%

Recent Progress of Bioinspired Scalephobic Surfaces with Specific Barrier Layers

2021

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Bioinspired superwettable surfaces have been widely harnessed in diverse applications such as self-cleaning, oil/water separation, and liquid transport. So far, only a little work is focused on scalephobic capability of those superwettable surfaces. However, the troublesome scale deposition will inevitably be observed in our daily production and life, greatly reducing heat transfer efficiency and inhibiting the liquid transport. To address this annoying problem, as the emerging strategy, specific barrier layers are introduced onto superwettable surfaces to reduce or even avoid the direct contact between scale and the surfaces. In this feature article, we first provide the basic concept of bioinspired scalephobic surfaces with specific barrier layers. Then, we briefly introduce the typical fabrication methods of scalephobic surfaces. Later, we summarize recent progress of bioinspired scalephobic surfaces with specific barrier layers. Furthermore, we point out the guiding theory and criteria for the stability of barrier layers. Finally, we put forward the forecast on the existing problems and future direction in bioinspired scalephobic surfaces.

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Section: Discussionmentioning

confidence: 99%

Recent Progress of Bioinspired Scalephobic Surfaces with Specific Barrier Layers

2021

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“…Over the last few decades, the effectiveness of riblets in drag reduction has been demonstrated in many experiments [23][24][25]. However, the spacing (s) and height (h) of the riblet are kept constant to avoid the difficulty of fabrication [26][27][28][29][30]. The spacing and height of the denticle of practical sharkskin change with the spatial gradient to better adapt to the complex fluid flow by selfadaptation [31,32].…”

Section: Introductionmentioning

confidence: 99%

Controllable deformation based self‐adaptive drag reduction for complex surface

Chen

Cui

Chen

2023

Biosurface and Biotribology

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Reduction of energy consumption and improvement of cruising speed are greatly necessary for underwater vehicles. Previously, regular riblets have been machined and the drag reduction has been verified; however, the riblet parameters are not adjusted like the denticles of sharkskin, which adapt quickly to the complex changing fluid flow. To achieve an improved drag reduction effect on the complicated shape surface, a simple, low‐cost, and timesaving stretching approach was proposed to adjust the riblet parameters on the underwater vehicle surface by controllable deformation. Nature latex rubber membrane with regular micro‐riblets was prepared as a stretching flexible film, and the spacing and height of the micro‐riblets were adjusted by adaptive control of the stretching ratio. The circulating water channel experiment verified the effectiveness and feasibility of the self‐adaptive drag reduction by the controllable deformation method. The results demonstrated that the drag reduction rate of the controllable deformation bionic fish skin was 4.26% compared with a smooth surface at 0.25 m/s with an angle of attack of 0°, which is better than any other angle. The controllable deformation bionic fish skin provides a feasible method for the drag reduction of complex surface adaptive underwater vehicles.

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“…As emphasized by Fu et al [36], sharkskin is not a smooth surface but a kind of microgrooved surface with micro-scales called dermal denticles. Currently, research on drag reduction with microgrooved surfaces inspired by sharkskin is a hot topic [36][37][38][39]. However, with respect to airfoils or hydrofoils, most scholars have concentrated on flow field characteristics [40][41][42][43][44], and to the authors' knowledge, few studies have reported on the noise performance of airfoils with microgrooved surfaces inspired by sharkskin, which is addressed in this paper.…”

Section: Introductionmentioning

confidence: 99%

“…In fact, the microgrooves of real sharkskin are not parallel to the flow direction totally. Some researchers have also investigated microgrooves or riblets across the flow direction [36,39,43,44], which is the research object in this study. The layout of this paper is as follows: Section 1 gives a brief introduction and Section 2 briefly demonstrates the theory of numerical simulation of this paper.…”

Section: Introductionmentioning

confidence: 99%

Reduction of Hydrodynamic Noise of 3D Hydrofoil with Spanwise Microgrooved Surfaces Inspired by Sharkskin

Dang

Mao

Tian

2019

JMSE

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Loud hydrodynamic noise is not only potentially harmful to the health of organisms in the ocean, but it is also a threat to the survival of underwater vehicles. Different from the general noise reduction technologies at present, a new idea for a flow-induced noise reduction design with spanwise microgrooved surfaces inspired by sharkskin is introduced in this paper. Large eddy simulations (LES) combined with the Ffowcs Williams and Hawkings (FW-H) equation are adopted to simulate the hydrodynamic noise of the three-dimensional (3D) hydrofoil. The accuracy of the numerical predictions is checked against existing experimental data, achieving good agreement. With the increase of observing distance, the noise reduction effect at the trailing edge direction is gradually apparent, and a maximum noise reduction of up to 7.28 dB can be observed. It is seen from the noise spectra of the biomimetic hydrofoil that the main peaks are eliminated, and the noise level at high frequency is also decreased. The cause of noise reduction lies in the secondary vortex generated in the microgrooves, which hinder the process of turbulence, consume the energy of the flow, and weaken the intensity of turbulent burst. The results of this study provide a new way to design low-noise underwater structures with hydrofoils.

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Drag reducing surface fabrication with deformed sharkskin morphology

Cited by 14 publications

References 23 publications

Recent Progress of Bioinspired Scalephobic Surfaces with Specific Barrier Layers

Recent Progress of Bioinspired Scalephobic Surfaces with Specific Barrier Layers

Controllable deformation based self‐adaptive drag reduction for complex surface

Reduction of Hydrodynamic Noise of 3D Hydrofoil with Spanwise Microgrooved Surfaces Inspired by Sharkskin

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