Transient velocity profiles and drag reduction due to air-filled superhydrophobic grooves

Kitagawa, Atsuhide; Shiomi, Yuriko; Murai, Yuichi; Denissenko, Petr

doi:10.1007/s00348-020-03070-x

Cited by 4 publications

(3 citation statements)

References 31 publications

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“…The steel balls coated with hydrophobic agents showed superhydrophobicity because of the thin air layer on the surface, which reduces resistance by 80%. Kitagawa et al [92] investigated the role of the hydrophobic region in stabilizing the water-gas interface in the trench, and hydrophobic tape can stabilize the air-water interface in the trench at a wider Reynolds number (Figure 5a). By cutting the energy of the interface, especially when Reynolds number equals 3000 and 4000, the SHS can cause turbulence to decay.…”

Section: Reynolds Numbermentioning

confidence: 99%

“…Reproduced with permission. [92] Copyright 2020, Springer. b) Instantaneous vortical structure (spanwise vorticity, around an NACA0012 hydrofoil at different angles of attack at Rec = 5000: α = 0°, c) α = 5°, d) α = 20°.…”

Section: Attack Anglementioning

confidence: 99%

mentioning

confidence: 99%

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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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Section: Reynolds Numbermentioning

confidence: 99%

Section: Attack Anglementioning

confidence: 99%