Abstract: The heat transfer and flow characteristics of 85% glycerin in smooth tubes bundle supported by evenly spaced twisted tapes was studied and compared with the thermal performance of smooth tubes bundle by numerical simulation. Meanwhile, slowly changing effective heat transfer temperature difference characteristic of heat transfer replacement method of highly viscous fluid was also discussed. The results indicated smooth tubes bundle supported by evenly spaced twisted tapes has a better integrated performance than single smooth tubes bundle under laminar flow and smaller twist ratio and bigger angle of twisted tapes was more efficient to improve integrated performance. Furthermore, in the containing evenly spaced twisted tapes segments of smooth tubes bundle supported by evenly spaced twisted tapes，the heat transfer rate can be improved by both enhancement of heat transfer coefficient and increasement of effective heat transfer temperature difference, and slowly changing effective heat transfer temperature difference can be employed to continue to improve heat transfer rate in downstream of twisted tapes, which indicated a novel way to enhance heat transfer of avoiding more fluid replacement frequency and saving more fluid transporting power.

Key words: heat transfer enhancement, twisted tape support, effective temperature difference

摘要： 通过数值模拟，研究了85%甘油在旋流片支撑光滑管管束间纵向流动的传热与流阻特性，并与无支撑光滑管束的纵向流动进行了对比，揭示了高粘度流体置换类强化传热方法的有效传热温差缓变特性机理。研究结果表明，层流时，小扭率与大角度旋流片支撑的光滑管管束的传热综合性能更佳，旋流片支撑光滑管管束在有旋流片段可以通过提高有效传热系数与增加有效传热温差的双重途径提高传热速率，而在旋流片下游段则可以利用有效传热温差的缓变特性继续维持较大的传热速率，从而能避免过多的流体置换次数，极大幅度的降低了流体的输送功耗。

关键词: 强化传热, 旋流片, 有效传热温差