论文部分内容阅读
实验研究了氧化铜纳米悬浮液在内径为 0 .6 8mm不锈钢细圆管内强迫流动和对流换热。氧化铜纳米颗粒悬浮液的质量分数W为 0 .0 2～ 0 .0 6 ,分别对去离子水和水 -纳米颗粒悬浮液的流动、传热特性进行了实验测定。实验结果表明 :所研究尺度下 ,层流向湍流过渡早于常规大尺度流动 ;悬浮液的压降要大于去离子水的 ;纳米颗粒的质量分数越大 ,压力降也越大 ;悬浮液的对流换热系数随颗粒质量分数的增大而增大
The experimental study of forced flow and convective heat transfer of copper oxide nanosuspension in a 0.86mm stainless steel tube with inner diameter is carried out. The mass fraction of copper oxide nanoparticle suspension is from 0.2 to 0.6, and the flow and heat transfer characteristics of deionized water and water-nanoparticle suspension are measured respectively. The experimental results show that the laminar-to-turbulent flow is earlier than conventional large-scale flow at the scale studied, the pressure drop of suspension is greater than that of deionized water, the larger the mass fraction of nanoparticles is, the larger the pressure drop is. The heat transfer coefficient increases with the increase of particle mass fraction