Bionic surface structure for strengthening evaporation heat exchanging of liquid film

Abstract

The invention discloses a bionic surface structure for strengthening evaporation heat exchanging of a liquid film, which is characterized in that three-dimensional bionic zigzag unit bodies are distributed on the surface of a substrate of a heat transferring pipe or a heat transferring plate, and the structural size of each three-dimensional bionic zigzag unit body is nanometer grade or millimeter grade; the three-dimensional bionic zigzag unit bodies are obliquely arranged, the inclined direction of the three-dimensional bionic zigzag unit bodies is consistent with the flowing direction of the liquid film, and the inclined three-dimensional bionic zigzag unit bodies are mutually lapped with one another; a sharp part of each three-dimensional bionic zigzag unit body is provided with three micro-sized micro zigzag structures, and the three micro-sized micro zigzag structures are arranged in a manner that two lower micro zigzag structures are arranged on two ends and one higher micro zigzag structure is arranged in the middle, and the heights of the two lower micro zigzag structures are identical to each other; the three-dimensional bionic zigzag unit bodies are distributed in a rhombic shape or a rectangular shape; the three-dimensional bionic zigzag unit bodies are mutually lapped with one another, so that the liquid film can be uniformly spread, and dry spots or dry points can be prevented from appearing on the surface; and the zigzag structure surface can control the flowing direction of the liquid film, so that the thickness of the liquid film is reduced, the heat transferring resistance can be effectively reduced, and the evaporation heat transferring efficiency of the liquid film is increased.

Description

technical field [0001] The invention relates to a surface structure, in particular to a bionic surface structure for enhancing liquid film evaporation heat transfer. Background technique [0002] Liquid film evaporation heat transfer is a high-efficiency heat transfer technology developed in recent years. It has unique advantages such as small flow rate, small temperature difference, high heat and mass transfer coefficient, simple structure and low power consumption. It is used in traditional industrial fields and high-tech In the field of heat transfer enhancement under high heat flux has received outstanding attention. Studies have shown that the main reason affecting the heat and mass exchange of liquid film evaporation is the flow form of the liquid film and the thickness of the liquid film. How to maintain the stability of the liquid film flow, so that it can evenly wet the heat transfer surface, and prevent the heat transfer due to the liquid thin rupture. When dry sp...

AI Technical Summary

Problems solved by technology

If the wall shape or its size parameters are not properly selected, it may cause local temporary or permanent rupture of the liquid film and deteriorate the heat and mass transfer effect.

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