磁场作用下Cu-水纳米流体传热数值模拟

Numerical simulation on heat transfer of Cu-water nanofluid under magnetic field

对磁场作用下倾斜方腔内Cu-水纳米流体传热问题进行了数值模拟.利用中心差分算子对Cu-水纳米流体控制方程建立二阶精度差分格式,同时边界采用四阶精度差分离散,研究不同哈特曼数Ha、不同瑞利数Ra、不同倾斜角γ、不同纳米颗粒体积分数ϕ对Cu-水纳米流体传热效率的影响.数值结果表明,对于所考虑的Ra随着Cu-水纳米流体体积分数ϕ的增加,纳米流体的传热效率也随之增加.同时,对于相同的体积分数,纳米流体的传热效率随着倾斜角的增加而增强.

Numerical simulation on heat transfer of the Cu-water nanofluid in an inclined square enclosure under the action of a magnetic field is carried out.The central difference operator is used to establish a second-order precision difference scheme for the Cu-water nanofluid control equation,and the boundary is discretized by a fourth-order precision difference.The influences of different Hartmann numbers,different Rayleigh numbers,different inclination angles,and different nanoparticle volume fractions on the heat transfer efficiency of Cu-water nanofluids are investigated.The numerical results show that the heat transfer efficiency of the nanofluid increases with the increase of the volume fraction of Cu-water nanofluids.At the same time,for the same volume fraction,the heat transfer efficiency of the nanofluid increases with the increase of the inclination angle.