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为深入研究不同实验条件下新型弹性管束的传热特性,建立了传热综合实验台,测试并计算得到了管束管外、管内及总传热系数随Re的变化曲线图。实验结果表明:新型弹性管束的管外平均表面传热系数基本为同Re数下的固定管束的3倍以上,强化传热效果明显。对比不同条件下的实验结果可以得出,汽-水换热条件最好、水-水换热条件次之、恒热流条件最差。原因为管内流体介质对弹性管束的振动特性影响较大,振动特性增强使得传热特性增强。
In order to further study the heat transfer characteristics of the new elastic tube bundles under different experimental conditions, a comprehensive heat transfer experimental platform was set up, and the curve of the tube heat transfer coefficient outside the tube bundle and the total heat transfer coefficient with Re was tested and calculated. The experimental results show that the average surface heat transfer coefficient of the new elastic tube bundles is more than 3 times that of the fixed tubes bundles under Reynolds number, and the heat transfer enhancement effect is obvious. Comparing the experimental results under different conditions, it can be concluded that the steam-water heat exchange is the best, the water-water heat exchange is the second, and the heat flux is the worst. The reason is that the fluid medium in the tube has a great influence on the vibration characteristics of the elastic tube bundle, and the enhanced vibration characteristics enhance the heat transfer characteristics.