In this study, the sinusoidal wavy (SW) copper microchannels with triangular cross section were fabricated with the ultrafast laser micromachining approach. The flow boiling of de-ionized water in SW microchannels were experimentally studied under mass fluxes of 43.43–217.15 kg (m 2 s) −1 and heat fluxes of 0–590 kW m −2 . The flow patterns in the SW microchannels were visually observed and the boiling heat transfer characteristics were analyzed based on the obtained data. It shows the SW microchannel has a maximum enhancement of 127.7% in the local heat transfer coefficient with an acceptable increase of pressure loss compared to the straight one in the present work. In SW microchannels, a low degree of superheat can trigger the onset of nucleate boiling. A slow decreasing tendency of local heat transfer coefficient under a high effective heat flux or a high vapor quality was observed. The heat transfer mechanism of flow boiling in SW microchannels w...

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超快激光微加工在波浪形铜微通道中两相沸腾的实验研究

在这项研究中，采用超快激光微加工方法制造了横截面为三角形的正弦波状（SW）铜微通道。在质量通量为43.43-217.15 kg（m 2 s）-1和热通量为0-590 kW m -2的条件下，对去离子水在微通道中的流动沸腾进行了实验研究。肉眼观察SW微通道中的流动模式，并基于获得的数据分析沸腾传热特性。结果表明，与本工作中的直通道相比，西南微通道的局部传热系数最大提高了127.7％，压力损失增加了可接受的范围。在西南部微通道中，过热程度低会触发核沸腾的发生。在高有效热通量或高蒸气质量下，观察到局部传热系数的缓慢下降趋势。SW微通道内流沸腾的传热机理