研究目的
To investigate the nucleate pool boiling heat transfer behavior of microstructured copper surfaces developed by using two different laser systems, namely, pulsed Nd:YAG laser and continuous wave laser.
研究成果
The study concluded that laser-processed surfaces exhibit better heat transfer performance compared to smooth surfaces, with continuous wave laser-processed surfaces showing higher enhancement in heat transfer coefficients. The heat transfer performance was found to be dependent on the laser power used during processing.
研究不足
The study is limited to the use of water as the pool liquid and atmospheric pressure conditions. The effect of other liquids and varying pressures on the heat transfer performance was not investigated.
1：Experimental Design and Method Selection:
The study utilized two different laser systems (pulsed Nd:YAG laser and continuous wave laser) to develop microstructured copper surfaces. The heat transfer performance of these surfaces was compared with a smooth surface using water as the pool liquid at atmospheric pressure and saturation temperature.
2：Sample Selection and Data Sources:
Copper test sections were processed with both types of lasers at varying power levels to observe the effect on microstructure and heat transfer performance.
3：List of Experimental Equipment and Materials:
Pulsed Nd:YAG laser (Quanta-Ray ND, Spectra Physics), continuous wave Ytterbium (Yb)-doped fiber laser (IPG Photonics), boiling container, condensing coil, heater assembly, power supply, and data acquisition system.
4：Experimental Procedures and Operational Workflow:
The heat flux was varied by adjusting voltage and current to the cartridge heaters. Temperature measurements were taken to calculate heat transfer coefficients and wall superheat.
5：Data Analysis Methods:
Heat transfer coefficients were calculated from measured heat flux and wall superheat. The results were compared with the Rohsenow correlation to validate the experimental data.
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