高频焊接与激光焊接翅片管传热性能对比试验

Contrast Experiment of the Performance of a High Frequency Welded and Laser Welded Finned Tube

对高频焊接与激光焊接翅片管的传热性能进行对比试验，得到了两个试件在不同管外空气流速下的传热数据，运用直接分离法将管外空气侧对流换热系数从总的传热系数中分离，获取管外空气侧换热系数，再通过拟舍方法获得管外空气侧换热关联式。研究表明：激光焊接翅片管的传热性能优于高频焊接翅片管，当空气流速为3m／s时，激光焊接翅片管的管外空气换热系数比同翅片尺寸的高频焊接翅片管的管外换热系数约高9％。

A contrast experiment of the heat transfer performance of a high frequency and laser welded finned tube was conducted to obtain the heat transfer data of two test pieces at various air flow speeds out- side a tube. The direct separation method was used to separate the convective heat exchange coefficient at the air side outside the tube from the total heat transfer coefficient to obtain the heat exchange coefficient at the air side outside the tube. Then, the fitting method was employed to obtain the correlation formula for calculating the amount of heat exchanged at the air side outside the tube. It has been found that the heat transfer performance of the laser welded finned tube is superior to that of the high frequency welded finned tube. When the air flow speed is 3 m/s, the heat exchange coefficient of the air outside the laser welded finned tube will be about 9% higher than that of the high frequency welded finned tube in the same size.