Rough surface for fractal structure

Abstract

The invention discloses a rough surface for a fractal structure. The rough surface comprises a substrate and is characterized in that: the substrate is provided with an uncondensable gas film layer; the uncondensable gas film layer consists of a compressed gas generator, a gas accommodating cavity and a porous core; the porous core is arranged on the surface of the substrate through a connecting piece; a gap between the substrate and the porous core forms the gas accommodating cavity; the outer surface of the porous core is provided with a rough structure; the rough structure is a series of micro fin structures with fractal characteristics, and at least two-stage concave-convex micro fins are distributed so as to form a superhydrophobic surface; and uncondensable gas generated by the uncondensable gas film layer maintains certain pressure and is soaked in pore spaces among the micro fin structures. The rough surface is combined with two flowing drag reduction technologies of the superhydrophobic surface and the gas film, so that the aims of high-efficient flow drag reduction and energy conservation can be fulfilled.

Description

technical field [0001] The invention relates to a functional structural element for flow drag reduction, in particular to a fractal structure rough surface. Background technique [0002] Superhydrophobic surfaces are a preferred technology to achieve flow drag reduction. When the surface is hydrophobic, reducing the surface free energy of the solid can improve the hydrophobicity of the solid surface, but it is impossible to achieve superhydrophobicity only by reducing the surface free energy of the material. The rough structure of the surface must be considered to achieve superhydrophobicity. The surface of lotus leaf is the perfect combination of rough surface and hydrophobic material. The self-cleaning and hydrophobic function of the lotus leaf effect inspires people to simulate the microstructure of the lotus leaf surface to prepare bionic surfaces with anti-adhesive and drag-reducing functions. Existing studies have shown that the hierarchical structure on the surface ...

AI Technical Summary

Problems solved by technology

When the surface is hydrophobic, reducing the surface free energy of the solid can improve the hydrophobicity of the solid surface, but it is impossible to achieve superhydrophobicity only by reducing the surface free energy of the material. The rough structure of the surface must be considered to achieve superhydrophobicity.

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