Cu-H2O纳米流体流动与强化换热的数值模拟研究

Numerical study of flow and enhanced heat transfer of Cu-HO nanofluid

模拟纳米流体在三维管道中的流动和强化传热过程,运用数值计算方法研究纳米流体的流动特性和传热机理,探究不同纳米颗粒体积分数和不同纳米颗粒大小在不同雷诺数(Re)下对纳米流体的流动和传热特性的影响。基于DPM模型对纳米流体在圆管中的对流换热进行了数值模拟研究,研究结果表明,在一定范围内,每增加0.5%的体积分数,纳米流体的传热性能平均增强7.82%。随着纳米颗粒的减小,纳米流体的传热系数不断增加。

The flow of nanofluids in three-dimensional pipes and the enhanced heat transfer were simulated, and the flow characteristics and heat transfer mechanism of nanofluids were studied by numerical simulation. The effects of different nanoparticle concentrations and different nanoparticle sizes on the flow and heat transfer characteristics of nanofluids under different Reynolds(Re) numbers were explored. Based on the DPM model, a numerical simulation study of the heat transfer of the nanofluid in a circular tube was carried out. The results show that within a certain range, the heat transfer performance of the nanofluid increases by 7.82% on average for every 0.5% increase in volume fraction. With the decrease of nanoparticles, the heat transfer coefficient of nanofluids is increasing.