Abstract The present work demonstrates the two-phase flow boiling heat transfer coefficient and pressure drop of R410A inside various minichannel multiport tubes. The experimental investigation was performed in four tube types with the hydraulic diameters of 1.16, 1.14, 1.07 and 0.96 mm and the number of parallel channels are 7, 11, 16 and 9, respectively. The data were conducted with the heat fluxes of 3 and 6 kW m−2, the mass flux ranging from 50 to 500 kg m−2 s−1, the saturation temperature of 6 °C and the vapor quality up to 1.0. The heat transfer coefficient of R410A was found to be affected by the heat flux, mass flux, vapor quality and the geometry of channel. The frictional pressure drop gradient was also affected by the mass flux and vapor quality but independent with the variation of heat flux. In addition, the present data were compared with various heat transfer coefficient correlations and pressure drop models in literature. Finally, new correlation of heat transfer coefficient was proposed based on the present experimental data.

中文翻译：

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R410A在各种微通道多通管中流动沸腾传热系数和压降的实验研究

摘要 目前的工作证明了R410A 在各种微通道多端口管内的两相流沸腾传热系数和压降。实验研究在水力直径分别为 1.16、1.14、1.07 和 0.96 毫米，平行通道数分别为 7、11、16 和 9 条的四种管中进行。数据是在热通量为 3 和 6 kW m-2，质量通量范围为 50 至 500 kg m-2 s-1，饱和温度为 6 °C 和蒸汽质量高达 1.0 的情况下进行的。发现 R410A 的传热系数受热通量、质量通量、蒸汽质量和通道几何形状的影响。摩擦压降梯度也受质量通量和蒸汽质量的影响，但与热通量的变化无关。此外，目前的数据与文献中的各种传热系数相关性和压降模型进行了比较。最后，在现有实验数据的基础上，提出了新的传热系数相关式。