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Two-phase flow heat transfer of propane vaporization in horizontal minichannels

机译:水平微型通道中丙烷气化的两相流传热

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Experiments were performed on the convective boiling heat transfer in horizontal minichannels using propane. The test section was made of stainless steel tubes with inner diameters of 1.5 mm and 3.0 mm and lengths of 1000 mm and 2000 mm, respectively, and it was uniformly heated by applying an electric current directly to the tubes. Local heat transfer coefficients were obtained for a heat flux range of 5–20 kW m?2, a mass flux range of 50–400 kg m?2 s?1, saturation temperatures of 10, 5, and 0°C and quality ranges of up to 1.0. The nucleate boiling heat transfer contribution was predominant, particularly at the low quality region. Decreases in the heat transfer coefficient occurred at a lower vapor quality with a rise of heat flux and mass flux, and with a lower saturation temperature and inner tube diameter. Laminar flow appeared in the minichannel flows. A new boiling heat transfer coefficient correlation that is based on the superposition model for propane was developed with 8.27% mean deviation.
机译:使用丙烷在水平微型通道中对流沸腾传热进行了实验。测试部分由内径分别为1.5mm和3.0mm,长度分别为1000mm和2000mm的不锈钢管制成,并通过直接向管子施加电流来对其均匀加热。在5-20 kW m?2 的热通量,50-400 kg m?2 s?1 的质量通量范围,饱和温度下获得了局部传热系数。温度为10、5和0°C,质量范围最高为1.0。核沸腾传热的贡献是主要的,特别是在低质量区域。在较低的蒸汽质量下,随着热通量和质量通量的增加,以及较低的饱和温度和内管直径,传热系数降低。层流出现在微通道流中。建立了基于丙烷叠加模型的沸腾传热系数相关系数,其平均偏差为8.27%。

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