Heat transfer intensification in tubes containing multiple twisted-tape bundle inserts was experimentally investigated. The experimental parameters included the tape numbers (N) of 2, 4 and 6 pieces, tape twist ratios (y/w) of 4.0, 5.0 and 6.0) and two different tape arrangements: co-swirl tapes (CoT) and counter-swirl tapes (CT). The tests were carried out using air as the working fluid under a constant heat flux. The experimental results showed that all multiple twisted tape bundles caused higher heat transfer rates, pressure losses and thermal hydraulic performance than a typical twisted tape. The heat transfer rate (Nu) and friction factor (f) increased with the number of tapes (N) and decreased with the twist ratio (y/w). At similar operating conditions, the counter-swirl flow twisted tape sets (CT) provided higher heat transfer (Nu) and friction factors (f) than the co-swirl flow sets (CoT). The highest thermal hydraulic performance (η) of 1.33, was offered by the twisted tapes having y/w = 4.0 and N = 6 at Re = 6000.

实验研究了包含多个扭曲带束插入物的管中的传热强化。实验参数包括2个，4个和6个条带数量（N），4.0、5.0和6.0的条带扭曲比（y / w）和两种不同的条带布置：共旋带（CoT）和反旋磁带（CT）。测试是在恒定热通量下使用空气作为工作流体进行的。实验结果表明，所有多条扭曲的带束束均比典型的扭曲的带束引起更高的传热速率，压力损失和热液压性能。传热率（Nu）和摩擦系数（f）随带数（N）并随着扭曲比（y / w）减小。在相似的运行条件下，逆流扭曲带组（CT）的热传递（Nu）和摩擦系数（f）比同向流扭曲带（CoT）高。y / w = 4.0 ，Re = 6000时N = 6的双绞带可提供最高的1.33热液压性能（η）。