本次工作的目的是测定二氧化钛纳米流体的对流换热系数。实验同时测量了纳米流体的导热系数和对流换热系数,实验比较发现纳米流体的导热系数和对流换热系数随着颗粒的浓度提高而提高。在实验管道内的不同位置纳米流体对流换热系数的提高也是不同的。纳米颗粒的迁移对流体边界层的影响被认为是主要的因素。 The purpose of this work is to determine the convective heat transfer coefficient of titanium dioxide nanofluids. The experiment also measured the thermal conductivity and convection heat transfer coefficient of nanofluids. The experimental results show that the thermal conductivity and convection heat transfer coefficient of nanofluids increase with the increase of particle concentration. The increase of convective heat transfer coefficient of nanofluid at different positions in the experimental pipe is also different. The effect of nanoparticle migration on the fluid boundary layer is considered to be a major factor.