A Simple, Low-cost Method to Fabricate Drag-reducing Coatings on a Macroscopic Model Ship

Wang, Zhipeng; Zhang, Songsong; Gao, Shan; Ouyang, Xiaoying; Li, Jie; Li, Rui; Wei, Hao; Shuai, Zhi-Jun; Li, Wanyou; Lyu, Shanshan

doi:10.1007/s40242-018-8032-2

Cited by 7 publications

(5 citation statements)

References 41 publications

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“…The BWSLS exhibits a high drag reduction rate at moderate flow velocities and Reynolds numbers. Notably, the BWSLS shows a significant improvement in the drag reduction rate of approximately 3–18% as compared to those of other biomimetic surfaces. − ,− The maximum drag reduction rate of 20.25% achieved by the BWSLS exceeds the conventional single-groove surface ,,, and CAS ,,− with a maximum optimized drag reduction rate of 18.76% . In contrast to the single-structured surfaces, the hierarchical structure of the BWSLS consisting of ridges and pores can capture large gas amounts, effectively reducing the velocity gradient near the wall and viscosity of the gas–liquid two-phase flow, thereby enhancing the interfacial slip and increasing the drag reduction efficiency.…”

Section: Resultsmentioning

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: Resultsmentioning

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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“…By use of copper foil tape attached to the hull model, this method is low cost and shows ≈16% drag reduction performance in resistance navigation experiments. [162] From the ship model to the oceangoing ships, the research on drag reduction of SHS needs further development. Xu et al [163] found that with the increase of Reynolds number, the resistance of the template is significantly lower than that of the smooth surface.…”

Section: Ships and Underwater Vehiclesmentioning

confidence: 99%

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Feng

Sun

Tian

2021

Adv Materials Inter

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Superhydrophobic surfaces (SHS) for underwater drag reduction draw more and more attention owing to its promising and wide applications such as underwater vehicles, pipeline oil transportation, and aquaculture. However, the drag reduction properties are inextricably linked to the stability of air layer on SHS. This review highlights recent advances regarding SHS for underwater drag reduction in the past three years. First, the fundamental theories are briefly described. Next, the crucial influencing factors, which include dimension and arrangement of particles, layout, and shape of the microstructures, Reynolds number, and attack angle on underwater drag reducing performance of SHS are thoroughly listed. Furthermore, the superior or inferior of these manufacturing techniques is also individually illustrated. After that, the solutions of enhancing stability of the air layer are explicitly classified. Then, the practical applications and its potential value in ships and underwater vehicles, microchannels, as well as fabrics are briefly discussed. Finally, the remaining challenges and promising breakthroughs in the field of SHS for underwater drag reduction are clarified in depth.

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“…5 Due to the thin air layer on the surface, the frictional resistance can be reduced by 80%. Wang et al 20 showed the drag-reducing performance is about 16% in the drag sailing experiment using a hull model, which was processed with stearic acid and ethanol. These studies on SHS only explored the effect of drag reduction.…”

Section: ■ Introductionmentioning

confidence: 99%

Ultrafast Self-Healing Superhydrophobic Surface for Underwater Drag Reduction

et al. 2022

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The self-healing superhydrophobic surfaces have attracted great interest owing to restoring superhydrophobicity without preparation crafts. However, the self-healing superhydrophobic surface still faces the dilemma of long repairing time. Especially in aqueous environments, superhydrophobic surfaces are highly susceptible to contamination and damage. In the current study, a superhydrophobic surface with ultrafast repairability was developed, which apply for drag reduction in aqueous medium. The prepared superhydrophobic surface can recover superhydrophobicity in only 30 s after severe physical and chemical damage. In addition, this research pioneered the combination of superhydrophobicity and porous structures for underwater drag reduction. The study of drag reduction confirms that the superhydrophobic surface can reduce the frictional drag by about 43% in the water. However, the drag reduction rate of the superhydrophobic surface with the porous structure can be improved to 76% due to increased stability of the air layer. More importantly, the porous structure with the average pore size of 50 μm has the most excellent stability through further experiments on the underwater air layer. This is attributed to the proper size of the pore to effectively balance the capillary force and resist wetting in the marginal region. This study will bring inspiration for the large-scale application of superhydrophobic surfaces and long-term drag reduction.

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A Simple, Low-cost Method to Fabricate Drag-reducing Coatings on a Macroscopic Model Ship

Cited by 7 publications

References 41 publications

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

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

Recent Developments of Superhydrophobic Surfaces (SHS) for Underwater Drag Reduction Opportunities and Challenges

Ultrafast Self-Healing Superhydrophobic Surface for Underwater Drag Reduction

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