초록 ▼

This invention solves the problem of reducing the fluid friction resistance accompanying relative movement of surfaces of a solid and a liquid. A superhydrophobic coating acting as a substrate for a gaseous lubricant of very low viscosity, reducing the fluid skin friction, has a hierarchic fracal s

This invention solves the problem of reducing the fluid friction resistance accompanying relative movement of surfaces of a solid and a liquid. A superhydrophobic coating acting as a substrate for a gaseous lubricant of very low viscosity, reducing the fluid skin friction, has a hierarchic fracal structural of the surface wherein the forms of the first hierarchic level (2, 3, 9) are located at the coating's substrate, and the forms of each successive hierarchic level (22, 33, 99) are located on the surface of the previous hierarchic level and the forms of individual higher hierarchic levels reiterate the forms of the lower hierarchic levels. Forms of at least two hierarchic levels of rows (2, 22) and ridges (3, 33, 99) occur in the coating and, also, the surface has anisotropic geometry, maximally developed fractally in the direction transverse to the direction of flow and maximally smooth in the direction of flow and, also, has channels located in the coating's substrate to ensure gas flow.

대표청구항 ▼

What is claimed is: 1. A superhydrophobic coating used as a substrate for gaseous lubricant of very low viscosity, which reduces the fluid skin friction drag, having a developed three-dimensional surface with concave and convex forms situated parallel to each other and to the fluid flow direction,

What is claimed is: 1. A superhydrophobic coating used as a substrate for gaseous lubricant of very low viscosity, which reduces the fluid skin friction drag, having a developed three-dimensional surface with concave and convex forms situated parallel to each other and to the fluid flow direction, characterised in that it has a fractal structure of hierarchic design, whose forms of the first hierarchic level(2), (3), (9) are located next to the coating substrate, whereas the forms of each successive hierarchic level (3), (33), (99) are located on the surface of forms of previous hierarchic levels, while the forms of individual structures of higher levels reiterate the shape of forms of lower hierarchic levels and the structure comprises forms of at least two hierarchic levels of grooves (2), (22) and ridges (3), ( 33), (99) and the surface has anisotropic geometry, maximally developed fractally in the direction transverse to the direction of flow and as smooth as possible in the direction of flow and has channels located in the coating's substrate to ensure gas flow. 2. The coating of claim 1, characterised in that it has a monolithic structure wherein the fractal grooves (2), (22) and ridges (3), (33), (99) are located directly on the surface of the material's layer (1). 3. The coating of claim 2, characterised in that it has a porous substrate with interconnected pores. 4. A coating of claim 3, characterised in that the grooves (2), (22) and ridges (3), ( 33) determine an omega-shaped contour of the cross section. 5. The coating of claim 3, characterised in that the grooves (2), (22) and ridges (3), (33 ) determine a sinusoidal contour of the cross section. 6. The coating of claim 3, characterised in that that the grooves (2), (22) and ridges (9), (99) determine a steplike contour of the cross section. 7. The coating of claim 2, characterised in that it has a uniform substrate, equipped with interconnected channels (4). 8. The coating of claim 1, characterised in that it has a semi-openwork structure wherein fractal grooves (2), (22) and ridges are situated in fibres (7) supported by the coating's substrate. 9. The coating of claim 8, characterised in that the fibres (7) are supported by the coating's substrate in a linear fashion. 10. The coating of claim 8, characterised in that the fibres (7) are supported by the coating's substrate in a pointwise fashion. 11. The coating of claim 1, characterised in that it has a semi-openwork structure wherein fractal grooves (2), (22) and ridges are situated in bundles (8) of fibres ( 7) supported by the coating's substrate. 12. The coating of claim 1, characterised in that it has a openwork structure wherein the fractal grooves (2), (22) and ridges (3), (33) are located in hairs (12), ( 12') whose bases are set in the substrate of the coating. 13. The coating of claim 12, characterised in that the hairs (12), (12') are attached with their both ends in the substrate of the coating, thus forming loops. 14. The coating of claim 11, characterised in that the hairs have flexible inserts (13). 15. The coating of claim 12, characterised in that the hairs (12), (12') have the structure of a woven layer (15). 16. The coating of claim 15, characterised in that the woven layer (15) has a parallel weave.