管内熔融盐强制对流传热的数值模拟

摘要

熔融盐作为太阳能热发电中的重要的传热蓄热介质, 其强制对流传热特性对如何强化对流传热和设计以熔融盐作为工质的换热器具有很重要的指导意义.建立了熔融盐-油套管式换热器内不同种类的熔融盐在不同工况下的强制对流传热模型, 数值模拟并理论研究了管内熔融盐强制对流传热特性, 提出数值模拟的熔融盐对流传热关联式;并将数值模拟结果与实验结果进行了对比.在此基础上分析了流速对管内熔融盐对流传热系数和热流密度的影响规律.结果表明在Re处于1000060000的范围内数值模拟和实验结果具有较好的一致性.%Numerical simulations were performed on forced convective heat transfer characteristics of molten salts in tubes. Correlations were proposed for the convective heat transfer coefficient. The numerical results were compared with experiments and a good agreement was obtained at a Reynold number between 10000 and 60000.