Q型内构件强化管内湍流流动与传热特性分析

摘要

This study investigates the turbulent flow and heat transfer characteristics in static mixers using Q⁃type twisted inserts ( QSM) . The investigation is performed by a numerical simulation of the heat transfer coef⁃ficient and the friction factor in RL⁃90⁃QSM, RR⁃90⁃QSM, and RR⁃00⁃QSM using ANSYS Fluent in the range of Re= 3 000~30 000. Distilled water is employed as the working fluid. The thermal performance factor of the QSM is investigated on the basis of the RL⁃90⁃KSM performance. The research results show that the values of the Nusselt number ( Nu) in RL⁃90⁃QSM, with the Reynolds number ( Re) increasing from 3 000 to 5 000, are the largest and are higher by approximately 7%~36% than that in the KSM, which illustrated a better thermal performance factor than RL⁃90⁃QSM. The Nu values are lower by 3%~8% and 4%~15% in RR⁃00⁃QSM and RR⁃90⁃QSM, respectively. The Nu values for Re>5 000 in RL⁃90⁃QSM increased by approximately 48% as compared to that in KSM. The thermal performance factor is higher than the other three components for Re>15 000. The thermal performance factors in RR⁃90⁃QSM and RR⁃00⁃QSM gradually decreased with in⁃creasing Re but are higher than that in the KSM.%为了研究内置 Q型扰流构件强化圆管内湍流流动与传热特性，以水为工质采用 ANSYS Fluent 软件在3000≤Re≤30000范围内对内置RL⁃90⁃QSM、RR⁃90⁃QSM和RR⁃00⁃QSM等3种构件的管内传热与流阻性能进行数值模拟，基于RL⁃90⁃KSM研究Q型构件强化传热综合性能。研究结果表明：在Re＝3000～5000，RL⁃90⁃QSM内传热Nu随Re的增大增加最快，较KSM内Nu提高约7％～36％，但其强化传热综合性能弱于KSM；而RR⁃00⁃QSM和RR⁃90⁃QSM内传热Nu分别较KSM降低约3％～8％和4％～15％。当Re＞5000时，RL⁃90⁃QSM内Nu较KSM提高约48％，特别是当Re＞15000时其强化传热综合性能高于其他三种构件；RR⁃90⁃QSM和RR⁃00⁃QSM的强化传热性能随Re增加逐渐降低，但其强化传热能力高于KSM。