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首页> 外文期刊>International Journal of Heat and Mass Transfer >Reflux condensation of steam inside a short vertical large diameter tube
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Reflux condensation of steam inside a short vertical large diameter tube

机译：短垂直大口径管内的蒸汽回流冷凝

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摘要

An experimental investigation of the reflux steam condensation inside a vertical tube at the atmospheric pressure is presented. The data were obtained for duralumin tube with the internal diameter of 200 mm, length of 220 mm and roughness height less than 0.05 mm. The film and vapor Reynolds numbers were varied within the range of 1-25 and 790-3680, respectively. The data were lower than Nusselt theory prediction. In contrast to Nusselt theory according to which the modified Nusselt number decreases with the film Reynolds number, the obtained data show inverse dependence when the film Reynolds number is less than ten. For fixed vapor Reynolds numbers there are the maximum values of the Nusselt number for definite film Reynolds numbers. The correlations are suggested for the Nusselt number in the case of a constant and variable wall temperature along the tube. The general correlation based on the presented and earlier published experimental data for the tubes with different height and diameter ratio is suggested in addition.
机译：提出了在大气压下垂直管内回流蒸汽冷凝的实验研究。获得的金属硬质合金管的内径为200毫米，长度为220毫米，粗糙度高度小于0.05毫米。薄膜和蒸气雷诺数分别在1-25和790-3680之间变化。数据低于Nusselt理论的预测。与根据修正的努塞尔数随胶片雷诺数减小的努塞尔理论不同，当影片雷诺数小于10时，所获得的数据显示出反相关性。对于固定的蒸气雷诺数，对于确定的胶片雷诺数，存在努塞尔数的最大值。在沿管壁温度恒定且变化的情况下，建议为Nusselt数建立相关性。此外，还提出了基于提出的和较早发表的不同高度和直径比的管的实验数据的一般相关性。

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