铜纳米流体的制备及微流动特性研究

Study on Cu Nano-fluid Preparation and Its Micro Flow Behavior

采用混合法配制了铜纳米粒子质量分数分别为1％和2％的铜-水纳米流体，通过添加相同质量分数的十二烷基苯磺酸钠分散剂并施加超声振动，使纳米流体的粒子稳定悬浮时间达30-40h。实验研究了所配制的纳米流体在压力驱动下流经直径分别为25μm和50μm的不同长度微圆管道的流动特性，并与蒸馏水流动特性及理论估算值进行了对比，发现纳米流体流量-压力特性基本呈线性关系，与理论估算值存在一定偏差，这主要是由尺度效应等所致。

A hybrid method with the dispersant and ultrasonic vibration was adopted to prepare Cu-water nano-fluid. Experimental results reveal that the particles in the nano-fluid can suspend stably for as long as 30-40 hours when the mass faction of Cu nano--particles is 1% or 2% and the dispersant of sodium dodecyl benzene sulfonate is of the same mass faction. Experimental research was carried out to study the flow performance of the pressure drived fluid in different micro pipes with the diameters of 25 mm and 50 mm and at different lengths. The results were compared with those of distilled water and theoretical calculated values. It is found that the volume flow is in linear relation to the pressure, but deviates from theoretical value, which is due to the size effect.