Bionic research on <i>Paramisgurnus dabryanus</i> scales for drag reduction

Wu, Laijun; Luo, Guihang; He, Feifan; Chen, Lei; Wang, Siqi; Fan, Xiaoguang

doi:10.1039/d2ra04073e

Cited by 5 publications

(2 citation statements)

References 40 publications

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“…Similarly, a surface with trapezoidal grooves imitating shark skin demonstrates a drag reduction rate of 6% . Additionally, a surface with fan-shaped pits simplified from loach scales exhibits a drag reduction rate of up to 17.25% . The formation of an underwater gas film on an SHS plays a crucial role in the drag reduction process. , However, various factors such as hydrostatic pressure and , fluid flow , promote the instability of the GLIs on SHSs, resulting in the loss of the surface gas film and subsequent drag reduction failure, which is a major challenge for superhydrophobic drag-reducing surfaces.…”

Section: Introductionmentioning

confidence: 99%

Effective Underwater Drag Reduction: A Butterfly Wing Scale-Inspired Superhydrophobic Surface

Chen,

Hu,

Zhang

2024

ACS Appl. Mater. Interfaces

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The microstructured superhydrophobic surface serves as an alternative strategy to decrease resistance of underwater vehicles, but the sustainment of an entrapped air layer and the stability of the corresponding gas−liquid interface within textures in flow shear or high pressure are still a great challenge. Inspired by the scales of Parantica melaneus wings, we propose a biomimetic surface with a hierarchical structure featuring longitudinal ridges and regular cavities that firmly pin the gas−liquid interface. The drag reduction rate of the Butterfly Wing Scale-Like Surface (BWSLS) demonstrates a noticeable rise over the single-scale textured mainstream biomimetic surfaces at moderate Reynolds numbers. The superior drag reduction mechanism is revealed as the synergistic effect of a thicker gas film and a more pronounced secondary vortex within the hierarchical textures. The former reduces the velocity gradient near the surface, while the latter decreases the vorticity and energy dissipation. In a high hydrostatic pressure environment, the proposed surface also demonstrates significant stability of the gas−liquid interface, with a gas coverage rate of over 67% during the cyclic loading, surpassing single-structured surfaces. Our study suggests promising surface designs for optimal drag reduction by mimicking and leveraging diverse surfaces of organisms adapted to oceanic climates.

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Section: Introductionmentioning

confidence: 99%

Effective Underwater Drag Reduction: A Butterfly Wing Scale-Inspired Superhydrophobic Surface

Chen,

Hu,

Zhang

2024

ACS Appl. Mater. Interfaces

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“…Reducing skin friction drag is the crucial step for minimizing energy consumption and enhancing the working performance of ships and underwater vessels, as well as long-distance oil transport in pipelines [ 1 , 2 ]. The mainstream approaches in the quest for drag reduction include superhydrophobic surfaces [ 3 , 4 , 5 ], jetting microbubbles [ 6 , 7 ], drag-reducing polymer additives [ 8 , 9 ], and bionic surfaces [ 10 , 11 , 12 ]. Superhydrophobic surfaces can achieve excellent drag reduction by sustaining a plastron that gives rise to a large slip length at the interface, but the plastron tends to break away under high shear conditions, resulting in the failure or even the drag increase of superhydrophobic surfaces [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces

Liu

Zhan

et al. 2023

Biomimetics

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Engineering marvels found throughout the exclusive structural features of biological surfaces have given rise to the progressive development of skin friction drag reduction. However, despite many previous works reporting forward drag reduction where the bio-inspired surface features are aligned with the flow direction, it is still challenging to achieve bidirectional drag reduction for non-morphable surface structures. Inspired by the flounder ctenoid scales characterized by tilted, millimeter-sized oval fins embedded with sub-millimeter spikes, we fabricate a bionic flounder two-tier structural surface (BFTSS) that can remarkably reduce the forward skin friction drag by ηdr = 19%. Even in the backwards direction, where the flow is completely against the tilting direction of surface structures, BFTSS still exhibits a considerable drag reduction of ηdr = 4.2%. Experiments and numerical simulations reveal that this unique bidirectional drag reduction is attributed to synergistic effects of the two-tier structures of BFTSS. The array of oval fins can distort the boundary layer flow and mitigate the viscous shear, whilst the microscale spikes act to promote the flow separation to relieve the pressure gradient in the viscous sublayer. Notably, the pressure gradient relief effect of microscale spikes remains invariant to the flow direction and is responsible for the backward drag reduction as well. The bidirectional drag reduction of BFTSS can be extensively applied in minimizing the energy consumption of ships and underwater vessels, as well as in pipeline transport.

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Application of Bionic Technology in Marine Cruise Equipment: Research Progress and Development Trends

Luo,

Yan,

Zhu

et al. 2024

J Bionic Eng

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Bionic research on Paramisgurnus dabryanus scales for drag reduction

Abstract: The large-area flexible surface of bionic loach scale was prepared by template method, and the bionic scales of Paramisgurnus dabryanus showed have a brilliant drag reduction performance.

Cited by 5 publications

References 40 publications

Effective Underwater Drag Reduction: A Butterfly Wing Scale-Inspired Superhydrophobic Surface

Effective Underwater Drag Reduction: A Butterfly Wing Scale-Inspired Superhydrophobic Surface

Bidirectional Underwater Drag Reduction on Bionic Flounder Two-Tier Structural Surfaces

Application of Bionic Technology in Marine Cruise Equipment: Research Progress and Development Trends

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