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首页> 外文期刊>International Journal of Heat and Fluid Flow >Flow boiling heat transfer of carbon dioxide in horizontal mini tubes
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Flow boiling heat transfer of carbon dioxide in horizontal mini tubes

机译：水平微型管中二氧化碳的流沸腾传热

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Flow boiling heat transfer coefficients of carbon dioxide (CO_2) in mini tubes with inner diameters of 2.0 and 0.98 mm are measured and analyzed as a function of operating parameters. The heat transfer coefficients are measured at high mass fluxes from 500 to 3570 kg/m~2 s, heat fluxes from 7 to 48 kW/m~2, and saturation temperatures of 0, 5 and 10℃. The measured heat transfer coefficients before dryout are in the range of 10000-20000 W/m~2 K. The heat transfer coefficients before critical vapor quality are strongly affected by heat flux at all mass flux conditions. However, the effects of mass flux on heat transfer coefficients before critical vapor quality are only significant when the superficial liquid Weber number is less than 100. The heat transfer characteristics after critical vapor quality are explained by partially dried liquid film and rate of liquid droplets in the vapor core. Based on the database obtained from this study and the literature, a boiling heat transfer correlation before critical vapor quality is developed.
机译：测量并分析了内径为2.0和0.98 mm的微型管中二氧化碳（CO_2）的沸腾传热系数，并将其作为工作参数的函数进行了分析。传热系数是在500至3570 kg / m〜2 s的大质量通量，7至48 kW / m〜2的热通量和0、5和10℃的饱和温度下测量的。变干前测得的传热系数在10000-20000 W / m〜2 K范围内。在所有质量通量条件下，临界蒸汽质量之前的传热系数都受到热通量的强烈影响。但是，只有当表面液体韦伯数小于100时，质量通量对临界蒸汽质量之前的传热系数的影响才显着。临界蒸汽质量之后的传热特性可以通过部分干燥的液膜和液滴的速率来解释。蒸气芯。基于从这项研究和文献中获得的数据库，在临界蒸汽质量之前就建立了沸腾传热的相关性。

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