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首页> 外文期刊>Journal of enhanced heat transfer >ENHANCED HEAT AND MASS TRANSFER OF FALLING LIQUID FILMS IN VERTICAL TUBES
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ENHANCED HEAT AND MASS TRANSFER OF FALLING LIQUID FILMS IN VERTICAL TUBES

机译：增强垂直管下落液膜的热量和传质

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摘要

The heat and mass transfer performances of falling liquid films subjected to evaporative heating and sensible heating inside two converging-diverging tubes were studied and compared to a built-in spring coil tube and a smooth tube. By studying the relationship between heat transfer coefficient and falling film flow rate, we found the converging-diverging tubes were appropriate for falling liquid films subjected to evaporative heating and sensible heating with larger Reynolds number. When the Reynolds number was larger, the converging-diverging tubes had a better heat transfer coefficient than the other two tubes. Within the converging-diverging tubes or the built-in spring coil tube, the evaporation heat transfer coefficient was larger than the sensible heating heat transfer coefficient, but the two coefficients in all these cases increased with the rise of falling film flow rate. According to the experimental data, the heat transfer correlations of falling films subjected to evaporative heating and sensible heating were obtained, which can be referred to in future engineering design and application.
机译：研究了经过蒸发加热的下降液体膜的热量和传质性能，并与两个会聚散热管内的合理加热进行研究，并与内置弹簧卷管和光滑的管相比。通过研究传热系数和薄膜流量之间的关系，我们发现会聚分歧管适用于经受蒸发加热和具有较大雷诺数的蒸发加热和明智加热的液体膜。当雷诺数较大时，会聚散热管具有比其他两个管更好的传热系数。在会聚散热管或内置弹簧线圈管内，蒸发传热系数大于明智的加热传热系数，但是所有这些情况下的两个系数随着薄膜流速的升高而增加。根据实验数据，获得了经受蒸发加热和明智加热的落膜的传热相关性，可在未来的工程设计和应用中提及。

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