Improving the performance of pool boiling with critical heat flux of pool boiling and enhancing the coefficient of heat transfer through surface modification technique have gained a lot of attention. These surface modifications can be done at different scales using various techniques. However, along with the performance improvement, the durability and stability of the surface modification are very crucial. Laser machining is an attractive option in this aspect and is gaining a lot of attention. In the present experimentation research work, pool boiling attributed performance of copper-grooved surfaces obtained through picosecond laser machining method is investigated. The performance of the modified surfaces was compared with the plain surface serving as reference. In this, three square grooved patterns with the same pitch (100 μm) and width (100 μm) but different depths (30, 70, and 100 μm) were investigated. Different depths were obtained by varying the scanning speed of the laser machine. In addition to the microchannel effect, the grain structuring during the laser machining process creates additional nucleation sites which has proven its effectiveness in improving the pool boiling performance. In all aspects, the pool boiling performance of the grooved laser-textured surface has showed increased surface characterisation as compared with the surface of copper.

中文翻译：

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使用激光纹理铜槽表面改善池沸腾传热特性的研究

以池沸腾临界热通量提高池沸腾性能和通过表面改性技术提高传热系数已引起广泛关注。这些表面改性可以使用各种技术以不同的规模进行。然而，随着性能的提升，表面改性的耐久性和稳定性也非常关键。激光加工在这方面是一个有吸引力的选择，并获得了很多关注。在目前的实验研究工作中，研究了通过皮秒激光加工方法获得的铜槽表面的池沸腾归因性能。将改性表面的性能与作为参考的平坦表面进行比较。在这方面，研究了具有相同间距 (100 μm) 和宽度 (100 μm) 但不同深度 (30、70 和 100 μm) 的三个方形凹槽图案。通过改变激光机的扫描速度获得不同的深度。除了微通道效应外，激光加工过程中的晶粒结构会产生额外的成核位点，这已证明其在改善池沸腾性能方面的有效性。在所有方面，与铜表面相比，带凹槽的激光纹理表面的池沸腾性能表现出更高的表面特征。激光加工过程中的晶粒结构会产生额外的成核位置，这已证明其在改善池沸腾性能方面的有效性。在所有方面，与铜表面相比，带凹槽的激光纹理表面的池沸腾性能表现出更高的表面特征。激光加工过程中的晶粒结构会产生额外的成核位置，这已证明其在改善池沸腾性能方面的有效性。在所有方面，与铜表面相比，带凹槽的激光纹理表面的池沸腾性能表现出更高的表面特征。