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本文对六种不同波距与波深比(p/e)的余弦型纵向波纹管的冷凝换热进行了实验研究和理论分析.在本实验的条件下,波纹管的平均冷凝换热系数是光管的4～7.5倍.在2.79≤D/e≤9.85的范围内,强化效果随p/e值的减小而增大.根据大量的实验数据得到波纹管的平均冷凝换热系数随冷凝液膜Re数和p/e的变化关系.运用数值方法,结合实验,从理论上分析计算了余弦型波纹管的冷凝换热系数.计算值与实验结果和国外的研究结果吻合较好.
The experimental study and theoretical analysis of the condensation heat transfer of cosine-type longitudinal bellows with six different wave lengths and wave depth ratios (p/e) are carried out in this paper. Under the conditions of this experiment, the average condensation heat transfer coefficient of the bellows is 4 to 7.5 times of the light pipe. In the range of 2.79 ≤ D/e ≤ 9.85, the strengthening effect increases with decreasing p/e value. According to a large number of experimental data, the average condensation heat transfer coefficient of the corrugated pipe is obtained with condensation. The relationship between the Re number of liquid film and the change of p/e is analyzed. The condensation heat transfer coefficient of the cosine type corrugated tube is theoretically calculated and numerically combined with experiments. The calculated values are in good agreement with experimental results and foreign research results.