微纳结构表面的制备工艺及传热性能实验

Surface Manipulation Technique of Multi-layer Micro-nano Structures and Experimental Investigation on Its Heat Transfer Enhancement

微纳结构表面因其优异的传热特性在高热流密度设备中有较好的应用前景,但传统的化学工艺制备方法不易控制表面结构,先进的激光刻蚀则制备成本较高。采用真空钎焊处理方法将工业编织百微米孔隙铜网与铜基表面相结合,制备出多层次微纳米复合结构表面。微距观测发现微纳表面沸腾汽化核心密度是光滑表面的5~8倍,呈现出显著的沸腾强化特征。宏观换热性能实验结果验证了换热性能的大幅增强,为微纳表面强化传热技术工业化应用提供参考。

The micro-nano structured surface has great application potential in cooling equipment with high heat flux due to its excellent heat transfer enhancement characteristics.However,the traditional chemical manipulation technique is not easy to control the fabricating quality,and the advanced laser etching method has high manipulation cost,which is not suitable for large-scale industrial applications.The multi-layer micro-nano structured surface was fabricated by combining the industrial braided 100-micron gap copper mesh with the copper substrate surface by vacuum brazing technique.The micro-nano surface nucleation core density is 5~8 times that of the smooth surface,which shows a significant boiling enhancement feature.The experimental results of macroscopic heat transfer performance verify the enhanced heat transfer performance and provide a reference for the industrial application of micro-nano surface enhanced heat transfer technology.