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Journal of Enhanced Heat Transfer
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ISSN Imprimer: 1065-5131
ISSN En ligne: 1026-5511

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Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.2018021256
pages 79-96

ENHANCED HEAT AND MASS TRANSFER OF FALLING LIQUID FILMS IN VERTICAL TUBES

Kuo Huang
School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, Guangdong 510640, People's Republic of China; Guangzhou Institute of Energy Testing, Guangzhou, Guangdong 511447, People's Republic of China
Xianhe Deng
School of Chemistry and Chemical Engineering, South China University and Technology, Guangzhou, Guangdong 510640, People's Republic of China

RÉSUMÉ

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.


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