Heat transfer characteristics of falling film evaporation on horizontal tube arrays
作者： Wei Li , Xiao-Yu Wu , Zhong Luo , Shi-chune Yao , Jin-Liang Xu
DOI: 10.1016/J.IJHEATMASSTRANSFER.2010.12.031
关键词: Evaporator 、 Heat transfer enhancement 、 Convection 、 Heat transfer coefficient 、 Thermodynamics 、 Heat exchanger 、 Heat transfer 、 Materials science 、 Nusselt number 、 Mechanics 、 Evaporation
摘要: Abstract A falling film heat transfer test facility has been built for the measurement of evaporation in a vacuum about 1000 Pa. At this condition, only convective occurred liquid film. The Reynolds numbers over range from 21.6 to 108.1 were tested on six-tube arrays made enhanced or smooth tubes. Results show that tubes with both outer and inner surfaces give high flux. Besides, as number increases, enhancement ratio decreases. semi-analytical correlation is established predict coefficients tube arrays, considering contributions partially dryout fully wet regimes, respectively. For tubes, ratios also correlated.
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