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首页> 外文期刊>International Journal of Heat and Mass Transfer >A new correlation of flow boiling heat transfer coefficients for carbon dioxide
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A new correlation of flow boiling heat transfer coefficients for carbon dioxide

机译：二氧化碳流沸腾换热系数的新关系

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摘要

Carbon dioxide (CO_2) has remarkable different flow boiling heat transfer characteristics from conventional refrigerants when evaporating at similar temperatures, for which a CO_2-specific correlation of evaporative heat transfer coefficients is necessary. A number of correlations for two-phase flow boiling heat transfer coefficients were proposed, among which some are CO_2-specific. However, their prediction accuracies for CO_2 were not satisfactory. This work proposes a new CO_2-specific correlation of flow boiling heat transfer coefficients based on the CO_2 database of 2956 experimental data points collected from 13 independent studies. The new correlation incorporates a new dimensionless number and makes great progress in the prediction accuracy. It has a mean absolute deviation of 15.5%, and predicts 72.5% of the entire database within ±20% and 89.1% of the entire database within ±30%, far better than the most influential existing counterpart. The new dimensionless number is associated with the formation and departure of bubbles.
机译：在相似的温度下蒸发时，二氧化碳（CO_2）与常规制冷剂的流动沸腾传热特性显着不同，为此，必须与蒸发传热系数进行CO_2特定的关联。提出了许多与两相流沸腾传热系数的相关性，其中一些与CO_2有关。但是，他们对CO_2的预测精度并不令人满意。这项工作基于从13项独立研究收集的2956个实验数据点的CO_2数据库，提出了一种新的与CO_2特定的流沸腾传热系数相关性。新的相关性合并了新的无量纲数，并在预测准确性方面取得了长足进步。它的平均绝对偏差为15.5％，并预测整个数据库的72.5％在±20％的范围内，而预测整个数据库的89.1％在±30％的范围内，远胜于最具影响力的现有同类数据库。新的无量纲数与气泡的形成和离开有关。

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