Abstract This study experimentally investigated pool boiling heat transfer on copper tubes for superhydrophilic surfaces with square patterns of different wettability levels. Deionized (DI) water was used as a working fluid. A silica-based coating mechanism and the picosecond (ps) laser system were combined to fabricate samples with different surface wettability levels. The contact angle values of four types of samples were in the range 0°–150°. The boiling experiments were conducted under ambient conditions up to a maximum heat flux regime of 418 kW/m2 and a saturated working fluid. Compared with the homogeneous plain copper surface, the heat transfer coefficient of the biphilic surface with hydrophobic patterns was enhanced up to 1.16, whereas that with superhydrophobic patterns decreased to 0.83 at the highest evaluated heat flux (418 kW/m2) because surface wettability led to different bubble dynamics. Bubble dynamics, on different samples were analyzed through high-speed imaging at three intervals of heat flux.

中文翻译：

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双亲模式润湿性水平差异对池沸腾传热铜管的影响

摘要 本研究通过实验研究了具有不同润湿性水平的方形图案的超亲水表面铜管上的池沸腾传热。去离子 (DI) 水用作工作流体。基于二氧化硅的涂层机制和皮秒 (ps) 激光系统相结合，以制造具有不同表面润湿性水平的样品。四种样品的接触角值在0°-150°范围内。沸腾实验是在环境条件下进行的，最大热通量范围为 418 kW/m2，工作流体饱和。与均质素铜表面相比，疏水图案的双亲表面传热系数提高到1.16，而超疏水图案的传热系数降低到0。83 在最高评估的热通量 (418 kW/m2) 下，因为表面润湿性导致不同的气泡动力学。通过高速成像以三个热通量间隔对不同样品的气泡动力学进行分析。