Abstract: Effective heat-transfer temperature difference (EHTD) was applied in the investigation of the heat-transfer enhancement theory with laminar flow in heat exchanger. Investigation was performed on the phenomenon, details and the law of EHTD, which reveals the intrinsic mechanism of laminar heat transfer enhancement with inserts. The suitable utilization method of the slowly varying characteristic of EHTD was discussed, and the optimization approach to improve EHTD was put forward. Collaborative heat-transfer enhancement mechanism for rough rib surface with inserts in heat-transfer channels was analyzed, which reveals the effect and law of EHTD improved by the rough rib surface in laminar flow.

Key words: laminar flow, effective heat-transfer temperature difference, inserts, rough rib surface, compound heat transfer enhancement

摘要： 从层流流体有效传热温差的新视角出发, 分析与探讨了换热器层流传热的强化理论。首先对层流流体有效传热温差的现象、细节及其变化规律进行了分析, 揭示了采用插入物强化层流传热的内在强化机理, 探讨了有效传热温差缓变特性的合理利用方法, 提出了改善层流有效传热温差的寻优途径; 其次, 分析研究了缩放管粗糙传热肋面与插入物相配合的协同传热强化机理, 揭示了粗糙肋面协助改善层流有效传热温差的作用与规律。

关键词: 层流, 有效传热温差, 插入物, 粗糙肋面, 复合强化传热