细圆管内纳米颗粒悬浮液流动特性的实验研究

Experimental investigation on flow of nanoparticle suspension in mini tubes

实验研究了细圆管内氧化铜纳米颗粒悬浮液的流动特性. 试验段的管径为0.68 mm、1.01 mm和1.28 mm,氧化铜纳米颗粒的平均粒径为50 nm,悬浮液中氧化铜纳米颗粒的质量分数分别为0.02, 0.04和0.06,分散剂十二烷基苯磺酸钠(SDBS)质量的分数为0.02. 实验结果显示,氧化铜纳米颗粒悬浮液的流动压降比去离子水的大,且正比于其质量分数;层流向湍流转化的临界雷诺数小于常规尺度的数值,且正比于管径.

Experiments were conducted to investigate the characteristics of water with copper oxide nanoparticle suspensions flowing through circular stainless steel tubes. The internal diameters of the tube are 0.68 mm, 1.01 mm and 1.28 mm. The mean diameter of the nanoparticle is 50 nm. The mass fractions of copper oxide nanoparticles in the experiment are 0.02, 0.04 and 0.06. The mass fraction of surfactant SDBS is 0.02. The result of the flow experiment shows that the pressure drop of copper oxide nanoparticle suspension is higher than that of the water. Pressure drop will increase if the mass fraction of the suspension increases. The critical Reynolds number of transition from laminar to turbulent flow, which appears earlier than in normal size tube case, would increase with the increasing of diameter.