局部冷壁面多孔介质梯形腔内纳米流体自然对流

Natural Convection Heat Transfer of Nanofluids in a Porous Trapezoidal Cavity with Partially Cooled Wall

在局部冷壁面条件下,对Cu-水纳米流体在多孔介质梯形腔内的自然对流换热进行了数值研究。主要讨论了达西数Da、瑞利数Ra、纳米粒子体积分数φ和局部冷壁面位置对自然对流换热的影响。数值计算结果表明,平均Nu数随着Da数、Ra数和φ的增加而增大。随着局部冷壁面位置向下移动,多孔介质梯形腔内Cu-水纳米流体流动强度逐渐减小,并且平均Nu数也减小。

Natural convection heat transfer of Cu-water nanofluids in a porous trapezoidal cavity with partially cooled wall is numerically studied in this paper.The effects of Darcy number,Rayleigh number,nanoparticles volume fraction and the position of partially cooled wall on natural convection heat transfer are mainly discussed.Numerical results show that with the increase of Darcy number,Rayleigh number and nanoparticles volume fraction,the average Nusselt number increases.As the position of partially cooled wall moves downward,the fluid flow intensity decreases gradually,and the average Nusselt number also decreases.