RT Journal Article
ID 01c06cfb277b9055
A1 Huang, Kuo 
A1 Deng, Xianhe
T1 ENHANCED HEAT AND MASS TRANSFER OF FALLING LIQUID FILMS IN VERTICAL TUBES
JF Journal of Enhanced Heat Transfer
JO JEH(T)
YR 2018
FD 2018-06-01
VO 25
IS 1
SP 79
OP 96
K1 displaced enhancement
K1 rough surface
K1 converging-diverging tube
K1 spring-coil insert
K1 single-phase flow
K1 two-phase flow
AB 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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