Research on flow characteristics and heat transfer of vertical falling film on sinusoidal corrugated plate under high Reynolds numbers
In order to study the effect of heat transfer characteristics and mechanism of falling liquid film in scrubbing cooling pipe under high Reynolds numbers(1.81×104-4.23×104),thickness distribution and heat transfer processes of liquid film in the pipe were studied via simulation.The results indicate that larger slot width and liquid film Re can have higher the liquid film thickness.The liquid phase outlet temperature increases with the wall temperature,and the maximum heat transfer coefficient is about 3.7×103 W·(m2·K)-1.The heat transfer coefficient decreases as the inlet temperature increases,with the maximum heat transfer coefficient of approximately 8.3×103 W·(m2·K)-1.The increase in liquid film Re increases the heat transfer coefficient with the maximum heat transfer coefficient of approximately 9.4×103 W·(m2·K)-1.The characteristic heat transfer coefficient h+is proportional to the liquid film Re.By studying gas-liquid two-phase heat transfer,it is found that the most intense heat transfer process happens at a distance of 0-0.1m.The heat transfer coefficient first increases and then decreases with the increase of gas phase temperature,and the maximum heat transfer coefficient is about 899 W·(m2·K)-1.The minimum error between the calculated data and the experimental correlation is about 10%.
falling filmhigh Reynolds numberliquid film distributionconvective heat transfergas-liquid phase transition
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