Abstract Pool boiling heat transfer characteristics of multiscale functionalized copper surfaces, fabricated by employing nanosecond laser surface processing (NLSP) technique, are studied in the present experimental investigation. The laser (Nd:YAG) used in this study to fabricate surfaces produces laser light with wavelengths of 1064 nm, 355 nm and 532 nm with varying laser powers. Experiments are conducted at atmospheric pressure and saturated pool boiling condition. The enhancement in heat transfer coefficient of laser processed surfaces compared to reference smooth surface is found to be 93 %, 62 % and 52 % for wavelength of 1064 nm, 355 nm and 532 nm, respectively. The formation of microstructure on surface as a result of laser processing is seemed to be prime reason behind heat transfer enhancement.

中文翻译：

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使用激光加工表面增强核池沸腾的传热：激光波长和功率变化的影响

摘要 本实验研究了采用纳秒激光表面处理（NLSP）技术制造的多尺度功能化铜表面的池沸腾传热特性。本研究中用于制造表面的激光 (Nd:YAG) 产生的激光波长为 1064 nm、355 nm 和 532 nm，具有不同的激光功率。实验在常压和饱和池沸腾条件下进行。与参考光滑表面相比，激光加工表面的传热系数在 1064 nm、355 nm 和 532 nm 波长下分别提高了 93%、62% 和 52%。由于激光加工而在表面形成微结构似乎是强化传热的主要原因。