立式蒸发式冷凝器强化传热实验研究

Experimental research on heat transfer enhancement of vertical evaportive condenser

在立式蒸发式冷凝器水蒸汽排汽冷凝实验基础上,对圆管、插入螺旋线圆管和波纹管3种管形的立式蒸发式冷凝器进行强化传热研究。结果表明:采用插入螺旋线圆管或者波纹管都可以起到强化传热的效果,总传热系数K比圆管分别高8.7%、12.9%,但要付出增加空气流动阻力作为代价;Rwa是整个传热过程的控制热阻,它具有改变总热阻的最大潜力;插入螺旋线对降低气-液界面的热阻尤为明显,降幅达20.65%;波纹管对降低凝结换热侧的热阻尤为明显,降幅达35.85%。

Based on the experiment of vertical evaporative condenser in water vapor condensation,the heat transfer enhancement of tube, spiral inserted tube and wavy tube were studied. The results show heat transfer can be enhanced by spiral inserted tube or wavy tube, the total heat transfer coefficient is higher than the tube, respectively 8.7% and 12.9% , but the cost of increased air flow resistance is required. The results also show the heat resistance at the air-water interface predominates over all other heat resistance, air-water interface heat resistance is particularly declined up to 20.65% with spiral inserted tube, and water condensation heat resistance is particularly declined up to 35.85% with wavy tube.