TiO_2纳米流体的对流换热系数测定

Measurement of the convective heat transfer of TiO_2 nano-fluids

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。

This paper is mainly concerned about the heat transfer coefficient of titania nano-fluids. Both of the thermal conductivity and the convective heat transfers of the samples are measured. Enhancements of the thermal conductivity and the heat transfer depend on enhancements of the nanoparticles concentration. Give other conditions, the enhancement flowing. Enhaneeme.nts of convective heat transfer coefficient are different in the different positions of experimental pipeline. The influence of particle migrations on the boundary layer of the flowing may be important factor.