A method for improving surface pool boiling heat transfer performance based on femtosecond laser splicing processing technology

Abstract

The invention relates to a method for improving surface pool boiling heat transfer performance based on femtosecond laser splicing processing technology, and belongs to the technical field of enhanced heat transfer. The rapid economic development has made stable heat dissipation under high heat flow an urgent problem to be solved. As an efficient and stable heat transfer method, boiling heat transfer has been studied more and more. The micro-nano improvement of the heat transfer surface has become an applied technology to enhance heat transfer. However, the problem that the heat transfer performance cannot be improved synchronously (CHF and HTC) has not been resolved. The femtosecond laser splicing processing technology proposed in the present invention improves the surface pool boiling heat transfer performance, which can simultaneously improve the surface heat transfer performance.

Description

technical field [0001] The invention relates to the technical field of enhanced heat transfer, in particular to a method for improving surface heat transfer performance by preparing spliced ​​surfaces through femtosecond laser splicing technology. Background technique [0002] With the development of society and the gradual improvement of the level of industrialization. As large as engineering equipment and as small as electronic devices, they are all developing in the direction of high integration and micro-scale, which means that the energy load per unit size of the material itself is getting higher and higher, and the stability and high efficiency of the high heat flow state Heat dissipation has become an urgent problem to be solved. The traditional heat dissipation method of strengthening convection can no longer meet such a huge heat dissipation demand. In contrast, boiling heat transfer utilizes a large amount of latent heat of vaporization or liquefaction in the pha...

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Problems solved by technology

[0004] However, the current surface improvement technology cannot make the heat transfer performance of the heat transfer surface greatly improved simultaneously. For example, the hydrophilic surface can greatly increase the CHF (critical heat flux), but at the same time, the hydrophilicity of the surface reduces the heat transfer coefficient of the surface.

The hydrophobic surface can greatly improve the HTC (heat transfer coefficient), but the hydrophobicity of the surface makes the surface easier to enter film boiling, which makes the CHF of the hydrophobic surface lower

In practical applications, both CHF and HTC are key characteristic quantities for evaluating surface heat transfer performance, and unilateral performance improvement largely limits the practical application of improved surfaces

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