微通道内Al_2O_3-水纳米流体强制对流换热的数值研究

采用有限容积法对微通道内Al_2O_3-水纳米流体的强制对流换热进行数值模拟研究。重点分析纳米颗粒粒径、纳米颗粒体积分数φ和Re数变化对强制对流换热的影响。研究结果表明:粒径小的纳米颗粒更有利于改善流体内部的能量传递过程,增强换热;在纳米颗粒粒径和Re数一定时,随着纳米颗粒体积分数φ的增加,平均努塞尔数Nuave增加,换热增强;在纳米颗粒粒径和体积分数一定时,随着Re数的增大,Nuave增加,换热明显增强。

Numerical Study of Forced Convection Heat Transfer of Al2O3-Water Nanofluids in Microchannels

Using finite volume method,numerical simulation study of forced convection heat transfer of Al2O3-water nanofluids in microchannels was carried out.The effects of the nanoparticle size,the volume fraction of nanoparticles φ and the number of Re on the forced convective heat transfer were mainly analyzed.The results showed that the nanoparticles with small particle size was more beneficial to improve the energy transfer process inside the fluid,and the heat transfer was enhanced;when the nanoparticle size and the number of Re were fixed,with the increase of particle volume fraction φ,the average Nusselt number Nuave was increased,the heat transfer was enhanced;when the particle size and volume fraction of nanoparticles were fixed,with the increase of Re number,Nuave was increased,the heat transfer was significantly enhanced.