Mechanisms and machine science, Journal Year: 2023, Volume and Issue: unknown, P. 69 - 78
Published: Jan. 1, 2023
Language: Английский
Progress in Organic Coatings, Journal Year: 2024, Volume and Issue: 189, P. 108349 - 108349
Published: Feb. 28, 2024
Language: Английский
Citations
20
Advanced Materials, Journal Year: 2025, Volume and Issue: unknown
Published: Jan. 16, 2025
Shark skin features superhydrophilic and riblet-textured denticles that provide drag reduction, antifouling, mechanical protection. The artificial riblet structures exhibit reduction capabilities in turbulent flow. However, the effects of surface wettability shark cavity region underneath denticle crown on remain insufficiently explored. Here, 3D printing is utilized to fabricate realistic staggered overlapped arrays, modified achieve superhydrophilic, superhydrophobic, hybrid configurations, including external riblets hydrophilic/internal cavities hydrophobic (ELIB), vice versa (EBIL). Denticles varying heights are also fabricated. results indicate ELIB, EBIL outperform ones reducing drag, achieving a peak rate ≈20%. Notably, shorter further improve reduction. Reduced vortex formation within correlates with improved These vortices can function similarly rolling bearings while facilitating momentum exchange increasing friction drag. Superhydrophobic or partially superhydrophobic (ELIBD/EBILD) mitigate this effect. This study suggests sharks may secrete mucus specific sections their reduce vorticity offering novel insights into biomimetic design for optimized
Language: Английский
Citations
2
Physics of Fluids, Journal Year: 2024, Volume and Issue: 36(1)
Published: Jan. 1, 2024
The transverse skin of dolphins exhibits a remarkable drag reduction effect. Although previous studies have identified the effect grooves, no clear guidelines exist regarding impact groove parameters on turbulent reduction. Hence, this paper suggests novel numerical study using Reynolds-averaged Navier–Stokes method to investigate influence half-sine wave structure drag. results showed that aspect ratio shape significantly affected rate by altering flow velocity and distribution near wall increasing viscous sublayer thickness. Moreover, index friction pressure FPr was introduced evaluate It revealed stable at optimal regardless velocity. By optimizing FPr, maximum 29.3% achieved. These findings provide insight for in drag-reducing surface applications.
Language: Английский
Citations
13
Progress in Organic Coatings, Journal Year: 2024, Volume and Issue: 188, P. 108213 - 108213
Published: Jan. 15, 2024
Language: Английский
Citations
9
Progress in Organic Coatings, Journal Year: 2023, Volume and Issue: 182, P. 107613 - 107613
Published: April 25, 2023
Language: Английский
Citations
21
Tribology International, Journal Year: 2024, Volume and Issue: 193, P. 109352 - 109352
Published: Feb. 2, 2024
Language: Английский
Citations
6
Chemical Engineering Journal, Journal Year: 2024, Volume and Issue: unknown, P. 156093 - 156093
Published: Sept. 1, 2024
Language: Английский
Citations
4
Advanced Engineering Materials, Journal Year: 2025, Volume and Issue: unknown
Published: March 26, 2025
Varying the height of microstructures is crucial for tuning surface properties such as wettability, adhesion, and optical characteristics, which are essential in applications from microfluidics to biosensing. However, conventional techniques fabricating height‐variable often costly labor‐intensive, involving multiple intricate steps. Herein, an innovative, rapid, cost‐effective approach using CO 2 laser‐machined poly (methyl methacrylate) (PMMA) molds produce polydimethylsiloxane (PDMS) introduced. The method leverages varying laser fluence precisely control feature depth on PMMA substrates, creating high‐fidelity negative without requiring chemical modifications. applicability Cassie–Baxter Wenzel equations systematically investigated. To this aim, six sharkskin surfaces with controlled gradients fabricated their wettability behavior studied. Results show pronounced anisotropic hydrophobicity, variations contact angles sliding one direction depending height‐induced curvature effects. These conclusions establish that classical wetting models neglect consider fully effect droplet behavior. By proposing a modified equation includes variable plane according heights, prediction validity onto structured enhanced. insights provide fundamental understanding microstructures.
Language: Английский
Citations
0
International Journal of Heat and Fluid Flow, Journal Year: 2025, Volume and Issue: 115, P. 109837 - 109837
Published: April 11, 2025
Language: Английский
Citations
0
Biosurface and Biotribology, Journal Year: 2024, Volume and Issue: 10(1), P. 7 - 15
Published: March 1, 2024
Abstract For high‐speed moving objects, drag reduction has been a prolonged major challenge. To address this problem, passive and negative strategies have proposed in the preceding decades. The integration of creatures nature continuously perfected during biological evolution. Unique structure characteristics, material properties, special functions marine organisms can provide inexhaustible inspirations to solve intractable problem reduction. Therefore, simple low‐cost laser ablation method was proposed. A multi‐scale multi‐level riblet (MSLR) surface inspired by denticles sharkskin fabricated controlling density path times. morphology topographic features were characterised using an electron microscope scanning white‐light interfering profilometer. Then, capacity bionic measured circulating water tunnel. Finally, mechanism analysed computational fluid dynamics (CFD) method. results show that MSLR stable with increase Reynold (Re) number which contributed high‐low velocity stripes formed on surface. This study reference for fabricating spatial riblets efficient at different values Re improving antifouling.
Language: Английский
Citations
3