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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on heat and mass transfer of falling liquid films in converging-diverging tubes with water
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Experimental study on heat and mass transfer of falling liquid films in converging-diverging tubes with water

机译：汇流管内降落液膜传热传质的实验研究

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摘要

To improve the heat and mass transfer performances of falling films and develop a new type of falling film evaporator, the heat and mass transfer characteristics of falling film evaporation and sensible heating in four different sizes of converging-diverging (CD) tubes were experimentally explored in this study. By analyzing the relationship between the heat transfer coefficient and the falling film flow rate, it was found that the CD tube is suitable for falling film evaporation and sensible heating with a large Reynolds number. For different sizes of tubes, the key factor affecting the heat transfer performance in falling film evaporation and sensible heating is the rib height. At the same rib height and rib pitch, the longer the converging segment of the CD tube, the better the heat transfer performance. According to the comparative analysis on heat and mass transfer performances of falling film evaporation and sensible heating inside the four CD tubes, the CD tube 3# is the best. The evaporation heat transfer coefficient (when the Reynolds number of the liquid films is 2356), evaporation mass transfer rate (when the perimeter flow rate of the liquid films is 0.173 kg/(m.s)), and sensible heating heat transfer coefficient (when the Reynolds number of the liquid films is 1635) of CD tube 3# are 62%, 38% and 63% higher than that of the smooth tube, respectively. For the same CD tube, the evaporation heat transfer coefficient is greater than the sensible heating heat transfer coefficient, but both increases as the flow rate increases. The heat transfer correlations of falling film evaporation and sensible heating in the experimental range were obtained. It will provide a useful reference for future engineering design and industrial applications. (C) 2018 Elsevier Ltd. All rights reserved.
机译：为了提高降膜的传热和传质性能，并开发出新型的降膜蒸发器，通过实验研究了四种不同尺寸的会聚-发散（CD）管中的降膜蒸发和显热的传热和传质特性。这项研究。通过分析传热系数和降膜流速之间的关系，发现CD管适合于大雷诺数的降膜蒸发和显热。对于不同尺寸的管，影响降膜蒸发和显热的传热性能的关键因素是肋的高度。在相同的肋骨高度和肋骨节距下，CD管的会聚段越长，传热性能越好。根据对四个CD管内部降膜蒸发和显热的传热传质性能的比较分析，CD管3＃是最好的。蒸发传热系数（当液膜的雷诺数为2356时），蒸发传质率（当液膜的周向流量为0.173 kg /（ms）时）和显热传热系数（当CD管3＃的液膜雷诺数为1635），分别比光滑管的雷诺数高62％，38％和63％。对于相同的CD管，蒸发传热系数大于显热传热系数，但是两者都随着流量的增加而增加。得到了降膜蒸发与显热在实验范围内的传热关系。它将为将来的工程设计和工业应用提供有用的参考。 （C）2018 Elsevier Ltd.保留所有权利。

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