Achieving large slip with superhydrophobic surfaces: Scaling laws for generic geometries | Zendy

Christophe Ybert | Zendy; Catherine Barentin | Zendy; Cécile Cottin-Bizonne | Zendy; Pierre Joseph | Zendy; Lydéric Bocquet | Zendy

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Achieving large slip with superhydrophobic surfaces: Scaling laws for generic geometries

Author(s) -

Christophe Ybert,

Catherine Barentin,

Cécile Cottin-Bizonne,

Pierre Joseph,

Lydéric Bocquet

Publication year - 2007

Publication title -

physics of fluids

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.188

H-Index - 180

eISSN - 1089-7666

pISSN - 1070-6631

DOI - 10.1063/1.2815730

Subject(s) - slip (aerodynamics) , materials science , scaling , scaling law , surface roughness , surface finish , mechanics , surface (topology) , length scale , composite material , solid surface , geometry , physics , chemical physics , mathematics , thermodynamics

International audienceWe investigate the hydrodynamic friction properties of superhydrophobic surfaces and quantify their superlubricating potential. On such surfaces, the contact of the liquid with the solid roughness is minimal, while most of the interface is a liquid-gas one, resulting in strongly reduced friction. We obtain scaling laws for the effective slip length at the surface in terms of the generic surface characteristics roughness length scale, depth, solid fraction of the interface, etc.. These predictions are successfully compared to numerical results in various geometries grooves, posts or holes. This approach provides a versatile framework for the description of slip on these composite surfaces. Slip lengths up to 100 microns are predicted for an optimized patterned surface

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