研究目的
Investigating the effect of picosecond laser machining on the wettability control of copper surfaces to enhance condensation heat transfer.
研究成果
Picosecond laser machining effectively enhances the condensation heat transfer performance of copper surfaces by modifying their wettability and surface morphology. The study demonstrates that increasing laser power increases groove depth and surface roughness, leading to improved heat transfer coefficients and heat flux.
研究不足
The study is limited to copper surfaces and specific laser parameters. The durability of the laser-structured surfaces under long-term operational conditions was not investigated.
1：Experimental Design and Method Selection:
The study employed picosecond laser machining to fabricate microgrooves on copper surfaces with varying laser powers to study their effect on wettability and condensation heat transfer.
2：Sample Selection and Data Sources:
Copper specimens were used, with surface morphologies characterized by SEM and wettability measured using a contact angle meter.
3：List of Experimental Equipment and Materials:
Q-switched Nd: YAG laser, White Light Interferometer, contact angle meter, high-speed camera, and K-type thermocouples were used.
4：Experimental Procedures and Operational Workflow:
Surfaces were irradiated with different laser powers, characterized, and then subjected to condensation experiments under various subcooling temperatures.
5：Data Analysis Methods:
Heat transfer coefficient and heat flux were calculated using Fourier's law of conduction and Newton’s law of cooling, with uncertainties determined by the Kline and McClintock method.
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