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Stratified Flow Condensation of CO_2 in a Tube at Low Temperatures

机译：低温下管中的CO_2分层流动缩合

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This study presents an experimental investigation of CO_2 flowing condensation at the saturation temperature of -10°C, mass flux in the range from 40 to 60kgm~(-2)s~(-1) and vapour quality ranging from 0.2 to 0.8, in a 6.52mm inside diameter horizontal tube. Previous research on refrigerant condensation has shown that under these conditions, CO_2 two phases are expected to develop as a stratified flow. The significant feature of the stratified flow heat transfer is vapour film condensation in the upper region which dominates the overall heat transfer process. Test series in this study confirm that the saturation-to-tube wall temperature difference has a significant influence on the condensing heat transfer coefficient when the temperature difference is within 3K. Comparisons between the experimental results and the predictions by the Dobson, Cavallini and Thome models show that CO_2 stratified flow condensation heat transfer coefficients are overpredicted by these models with mean deviations of 104%, 81% and 127%, respectively.
机译：本研究提出了在-10℃的饱和温度下的CO_2流动冷凝的实验研究，质量磁通量为40至60kgm〜（-2）S〜（-1），蒸气质量范围为0.2至0.8一个6.52mm内径水平管。以前关于制冷剂冷凝的研究表明，在这些条件下，预计CO_2两相将成为分层流动。分层流动传热的显着特征是上部区域中的蒸汽膜凝结，其主导整体传热过程。测试系列在本研究证实，当温差在3K内时，饱和对管壁温度差对冷凝传热系数具有显着影响。实验结果与Dobson，Cavallini和Thome模型的预测之间的比较表明，CO_2分层流动凝结传热系数由这些模型过度预测，其平均偏差分别为104％，81％和127％。

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