纳米颗粒球形度对平板通道中Al2O3-水纳米流体强制对流换热的影响

数值研究了水中添加立方体形、球形或柱状Al2O3纳米颗粒的纳米流体在平板通道中的层流强制对流换热,分析了纳米颗粒球形度、纳米颗粒体积分数和雷诺数对平板通道中Al2O3-水纳米流体强制对流换热的影响.结果表明:当纳米颗粒体积分数和雷诺数一定时,随着纳米颗粒球形度减小,通道壁面平均努赛尔数增大,对流换热增强;当纳米颗粒球形...

Effect of sphericity of nanoparticles on forced convection heat transfer of Al2O3- water nanofluid in a parallel-plate channel

A numerical calculation method was used to study the laminar forced convective heat transfer of water-based nanofluid with cubic, spherical or cylindrical Al₂O₃ nanoparticles in a flat plate channel. The effects of nanoparticle sphericity, nanoparticle volume fraction and Reynolds number on the forced convective heat transfer of Al₂O₃-water nanofluid in the flat plate channel were also analyzed. The results show that when nanoparticle volume fraction and Reynolds number keep constant, both the average Nusselt number on the channel wall and the intensity of convective heat transfer increase with the decrease of the sphericity of nanoparticles. With the increase of nanoparticle volume fraction and Reynolds number, the average Nusselt number on the channel wall becomes increasing when nanoparticle sphericity keeps constant and the corresponding intensity of the convective heat transfer increases also as a result.