Symmetry-Breaking Drop Bouncing on Superhydrophobic Surfaces with Continuously Changing Curvatures
| Autor: | Sungchan Yun, WooSeok Choi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Surface (mathematics)
Materials science Polymers and Plastics media_common.quotation_subject Drop (liquid) Enhanced heat transfer Organic chemistry interfacial dynamics General Chemistry Mechanics Residence time (fluid dynamics) Curvature Asymmetry Article Momentum Physics::Fluid Dynamics QD241-441 anisotropic surface superhydrophobic surface Anisotropy media_common |
| Zdroj: | Polymers Volume 13 Issue 17 Polymers, Vol 13, Iss 2940, p 2940 (2021) |
| ISSN: | 2073-4360 |
| Popis: | Controlling the residence time of drops on the solid surface is related to a wide spectrum of engineering applications, such as self-cleaning and anti-icing. The symmetry-breaking dynamics induced by the initial drop shape can promote drop bouncing. Here, we study the bouncing features of spherical and ellipsoidal drops on elliptical surfaces that continuously change curvatures inspired by natural succulent leaves. The bounce characteristics highly depend on the geometric relations between the ellipsoidal drops and curved surfaces. Numerical results show that ellipsoidal shapes of the drops amplify asymmetries of the mass and momentum in synergy with an influence of the surface curvature during the impact, which is verified by experiments. Effects of the surface anisotropy and drops’ ellipticity on the residence time are investigated under various surface morphologies and Weber numbers. The residence time is closely associated with an initial surface curvature at the apex. The underlying principle of modifying the residence time via the drops’ ellipticity and initial surface curvature is elucidated based on momentum asymmetry. The understanding of the bouncing features on curved surfaces will offer practical implications for enhanced heat transfer performances and controlled water repellency, etc. |
| Databáze: | OpenAIRE |
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