中文摘要：

为探讨波纹管和脉动流同时使用能否实现复合强化传热的效果，利用计算流体力学软件Fluent数值模拟了波纹管在管内流体发生周期性速度变化条件下的传热和阻力特性．模拟的边界条件为：管壁温度293K；管内工质为水，入口温度333K，平均流速0．02m／s，脉动频率厂分别取2、4、5、8、10Hz，振幅A分别取0．2、0．4、0．6、0．8、1；出口压力为0．通过分析传热强化系数、沿程阻力增强系数、效应评价准则数，结果显示：管内脉动流既能强化波纹管的传热也会弱化传热；相比稳态流条件，传热最大能被强化约5．9％；脉动流会增大波纹管的沿程阻力；综合考虑传热的强化作用和流动阻力的增加，在A≥O．8且，≥4Hz条件下，管内脉动与波纹管能起到复合强化传热效果；脉动流条件下波节附近漩涡周期性的产生和消失是传热被强化和沿程阻力增加的主要原因．

英文摘要：

To explore the possibility of complex enhanced heat transfer, the characteristic of heat transfer and pressure drop of pulsating flow in a corrugated tube was numerically studied by using commercial CFD package Fluent. The temperature of tube wall was fixed at 293K, water was set as the working fluid, inlet temperature was 333 K and mean velocity was 0.02 m/s, the frequency of pulsating fluid was set as 2 Hz, 4 Hz, 5 Hz, 8 Hz, 10 Hz and the magnitude of that was set as 0.2, 0.4, 0.6, 0. 8, 1, respectively, the pressure of outlet was set as 0. The enhancement coefficients of heat transfer and pressure drop were analyzed. The results show that heat transfer can either be enhanced or weakened by pulsating flow; compared with steady flow, heat transfer enhancement coefficient increases maximumly 5.9% ; pressure drop of corrugated tube is increased by pulsating flow. When A ≥0.8 and ≥4 Hz, the effect of pulsating flow on heat transfer is more obvious than that on pressure drop. The periodical formation and disappearance of vortex is the main reason for heat transfer enhancement and pressure drop.