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首页> 外文期刊>International Journal of Heat and Mass Transfer >Steam condensation on tube-bundle in presence of non-condensable gas under free convection
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Steam condensation on tube-bundle in presence of non-condensable gas under free convection

机译：在空闲对流下在不可凝聚气体存在下管束的蒸汽凝结

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摘要

In the presence of non-condensable gases, the effects of thermal-hydraulic parameters on steam condensation on a tube-bundle heat exchanger differ from those for a single-tube because the geometry of the tube-bundle enhances shadow and suction effects. In this study, experiments were performed to investigate these effects on three types of tube-bundle heat exchangers with pitch-to-diameter ratios of 2.0. 2.5, and 3.0, and pressures, air mass fractions, and wall subcooling of 200-500 kPa, 0.2-0.7, and 20-55 K, respectively. The local bundle factor was defined as the difference in condensation heat transfer coefficients between a single-tube and tubes in a tube-bundle. Therefore, a local bundle factor correlation, which accounts for the shadow and suction effects, was developed. The applicable ranges of the local bundle factor correlation for local pressure loss, Bird's suction factor, and blockage fraction were 0.267-0.734, 1.12-1.98, and 0.044-0.304, respectively. An average bundle factor was derived from the local bundle factor. The developed correlation applying the average bundle factor predicted the heat transfer coefficients for the obtained experimental data within an error of 8.50 %.
机译：在不可冷凝的气体存在下，热液压参数对管束热交换器上的蒸汽冷凝的影响与单管的蒸汽冷凝不同，因为管束的几何形状增强了阴影和抽吸效果。在该研究中，进行实验以研究与2.0的间距比率的三种管束热交换器的这些影响。 2.5和3.0，和压力，空气质量分数和壁过冷，分别为200-500kPa，0.2-0.7和20-55 k。局部束因子被定义为管束中单管和管之间的冷凝传热系数的差异。因此，开发了局部束因子相关性，其考虑阴影和抽吸效果。局部压力损失，鸟类吸入因子和堵塞分数的适用范围分别为0.267-0.734,1.12-1.98和0.044-0.304。平均束因子来自局部束因子。应用平均束因子的发达的相关性预测了所获得的实验数据的传热系数在8.50％的误差内。

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