涡节型、酒窝型强化管管内沸腾传热特性实验

Experimental study of boiling heat transfer in vortex tubes and dimple tubes

以微型Capstone C30燃气轮机排放的烟气余热为热源,研究涡节结构强化管、酒窝结构强化管和光管管内沸腾换热特性。实验结果表明:涡节型结构强化传热管管内沸腾换热系数约为光管的1.6~2.1倍,管外对流传热系数约为光管的1.3~1.5倍,总传热系数约为光管的1.4~1.5倍;酒窝型强化传热管管内沸腾换热系数约为光管的2.1~2.5倍,管外对流传热系数约为光管的1.8~2.0倍,总传热系数约为光管的1.9~2.1倍。分析了涡节型强化传热管和酒窝型强化传热管较光管传热性能好的原因。

With micro turbine Capstone C30 flue gas as the heat source,the characteristics of boiling heat transfer inside tubes including vortex tubes, dimple tubes and plain tubes were investigated experimentally.The results reveal that boiling heat transfer coefficient of vortex tubes is about 1.6 to 2.1 times that of the plain tubes,external surface heat transfer coefficient is about 1.3 to 1.5 times that of the plain tube,and the overall heat transfer coefficient is about 1.3 to 1.6 times that of the plain tubes;boiling heat transfer coefficient of dimpled tubes is about 2.1 to 2.5 times that of the plain tubes,external surface heat transfer coefficient is about 1.8 to 2.0 times that of the plain tube,and the overall heat transfer coefficient is about 1.9 to 2.1 times that of the plain tubes.And the reason why the heat transfer performance of vortex tubes and dimple tubes is better than that of the plain tubes is analyzed.