Patent ID: 6994045

Claim:
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.