Abstract: This paper researched on heat transfer enhancement and friction characteristics of tubes with alternatively arranged rotors with diameters 22mm and 19mm. Glycerin solution was used as tube-side working fluid and water was used as shell-side fluid. Experiment of smooth tube was carried out prior to the actual experiments，in order to ensure the reliability and accuracy of the experiment apparatus and methods. The experimental results revealed that：When rotors of diameters 22mm and 19mm were arranged at the ratio 1︰1，Nu and PEC were higher than when the ratio were at 2︰2 and 3︰3. The Nu value was 19.17%—34% higher than when the diameter was fixed at 19mm，and the PEC value was 1.78—2.37，indicating that the more frequent the two rotors were alternatively arranged，the better the effect of heat transfer enhancement was. The difference of resistance coefficients among the three scenarios was not significant compared to the situation when the diameter was 22mm，alternate arrangement of the large and small diameter rotors could be practical，considering saving materials and cost of industrial applications

Key words: heat transfer, assembled rotors, alternate arrangement, performance evaluation criteria（PEC）

摘要： 以甘油水溶液为管程流体，水为壳程流体，对外径22mm和外径19mm相间排列的转子组合的换热管进行了强化传热及阻力特性实验研究。为保证实验方法和实验结果的准确性，对光管进行了实验验证。实验结果表明：将外径22mm转子和外径19mm转子以1︰1进行相间排列的方案的 和PEC（综合评价因子）高于将两种转子以2︰2进行相间排列的方案，又高于将两者以3︰3进行相间排列的方案，其 比外径全19mm方案高出19.17%～34%，PEC值达到了1.78～2.37，说明将两种转子相间排列的越频繁，其换热效果就越好；尽管3种方案的阻力系数与外径全22mm方案相差不大，但是从工业大批量应用节省材料、节约成本的角度来说，将大小径转子相间排列还是具有实际意义的。

关键词: 传热, 转子组合, 相间排列, 综合评价因子PEC