关键词: 强化传热, 旋流片, 有效传热温差

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