Multiscale copper-based surface microstructures are required in miniaturized two-phase heat exchange devices. In this study, we propose a method that combines picosecond laser micromachining and electrodeposition to prepare copper-based two-tiered surface microstructures. The surface structures consist of periodic mini-grooves covered by dense microcones. The mini-grooves, prepared using ultrafast laser micromachining, offer a superior capillary transport performance. On the other hand, the microcone structures, prepared by electrodeposition, provide more effective nucleation sites for liquid–vapor phase changes. Compared to single-tiered mini-groove structures, the minigroove-microcone composite structures demonstrate an 8.2% increase in critical heat flux (CHF) and a 21–58% increase in heat transfer coefficient (HTC) during capillary-fed boiling tests. The method presented in this study introduces a new approach for fabricating high-performance wick structures suitable for ultrathin two-phase heat exchange devices.

中文翻译：

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通过皮秒激光微加工结合电沉积技术制备铜基两层表面微结构以增强两相传热


小型化两相换热器件需要多尺度铜基表面微结构。在这项研究中，我们提出了一种结合皮秒激光微加工和电沉积来制备铜基两层表面微结构的方法。表面结构由覆盖着致密微锥体的周期性小槽组成。使用超快激光微加工制备的微型槽具有卓越的毛细管传输性能。另一方面，通过电沉积制备的微锥结构为液-气相变化提供了更有效的成核位点。与单层迷你槽结构相比，在毛细管进料沸腾测试中，迷你槽-微锥复合结构的临界热通量 （CHF） 增加了 8.2%，传热系数 （HTC） 增加了 21-58%。本研究中提出的方法引入了一种制造适用于超薄两相换热器件的高性能灯芯结构的新方法。