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建立了湿空气流经平直翅片通道并伴有凝结现象发生的三维对流传热传质的数值模型,在空气进口雷诺数Re为190～3770,进口相对湿度φ_(in)为50%～90%的范围内,对干湿两种工况,平直翅片通道内的换热流动进行了对比研究。结果表明:湿工况换热系数为干工况换热系数的2.8～3.1倍,干工况翅片效率比湿工况翅片效率高35.8%～41.9%。当翅片为部分湿工况时,翅片效率随进口相对湿度的增大而增大,换热系数随进口相对湿度的增大而减小;当翅片为全湿工况后,进口相对湿度对翅片效率和换热系数的影响微弱。
A numerical model of three-dimensional convective heat and mass transfer with wet air passing through the straight fin passageway and associated with condensation was established. The Reynolds number Re at the air inlet was 190 ~ 3770 and the relative humidity φ in (inlet) was 50% ~ 90% of the range of wet and dry conditions, flat fins channel heat transfer in a comparative study. The results show that the heat transfer coefficient in wet condition is 2.8 ~ 3.1 times of the heat transfer coefficient in dry condition, and the efficiency of fin in dry condition is 35.8% ~ 41.9% higher than that in wet condition. When the fins are partially wet, the fin efficiency increases with the increase of the inlet relative humidity, while the heat transfer coefficient decreases with the increase of the inlet relative humidity. When the fins are in the wet condition, The effect of humidity on fin efficiency and heat transfer coefficient is weak.