纳米流体稳定性及对流传热特性研究

Research on the stability and convective heat transfer characteristics of nanofluids

以Cu纳米流体为例,探究表面活性剂和pH值对纳米流体稳定性的综合影响以及体积分数和温度对纳米流体对流传热特性的影响。研究结果表明:添加SDBS表面活性剂并且在弱酸性时可以最长保持11 d的稳定性;布朗运动和热泳运动对对流传热受到不同体积分数和温度表现出的影响不一致;在管道对流传热中,努塞尔数Nu随着体积分数和温度增大而增大。

Taking Cu nanofluid as an example,the combined effect of surfactant and pH on the stability of nanofluids and the effects of volume fraction and temperature on the convective heat transfer properties of nanofluids were investigated.The results of the study showed that the SDBS surfactant was added and remained stable for up to 11 days at weak acidity.Subjected to different volume fractions and temperatures,Brownian and thermophoretic motions exhibited inconsistent effects on convective heat transfer.In the convective heat transfer in ducts,the Nussle number increases with the increase of volume fraction and temperature.