研究目的
Investigating the therapeutic effects of a specific herbal medicine on a particular disease.
研究成果
The study demonstrated that sinusoidal wavy copper microchannels fabricated with ultrafast laser micromachining significantly enhance boiling heat transfer performance with an acceptable increase in pressure drop. The wavy structure and rough surface contribute to lower superheat for the onset of nucleate boiling and improved heat transfer coefficients. The flow boiling instability was effectively suppressed in wavy microchannels.
研究不足
The main limitation is the channel depth due to the characteristic of material ablation with ultrafast laser, leading to triangular cross sections for deeper channels. This affects the geometry and potentially the heat transfer performance.
1：Experimental Design and Method Selection:
The study involved the fabrication of sinusoidal wavy (SW) copper microchannels with triangular cross section using ultrafast laser micromachining. The flow boiling of de-ionized water in these microchannels was studied under various mass and heat fluxes.
2：Sample Selection and Data Sources:
De-ionized water was used as the working fluid. The flow patterns and boiling heat transfer characteristics were visually observed and analyzed.
3：List of Experimental Equipment and Materials:
The setup included a syringe pump for fluid delivery, a platinum film heater for heating, pressure transducers for pressure drop measurement, and a high-speed camera for flow visualization.
4：Experimental Procedures and Operational Workflow:
The working fluid was degassed before the experiment, heated to a desired temperature, and then flowed through the microchannels under controlled conditions. Temperature and pressure data were recorded.
5：Data Analysis Methods:
The heat transfer coefficient and pressure drop were calculated based on the recorded data. The flow patterns were analyzed to understand the boiling mechanisms.
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