一步法制备铜导热油纳米流体的导热系数与黏度  

Thermal conductivity and viscosity of Cu therminol nanofluid prepared by one-step method

作　　者：朱杰伟 周璐 张宇航 吉祝昊 马红和[1] ZHU Jie-wei;ZHOU Lu;ZHANG Yu-hang;JI Zhu-hao;MA Hong-he(School of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China)

机构地区：[1]太原理工大学电气与动力工程学院,山西太原030024

出　　处：《化学工程》2022年第5期30-35,共6页Chemical Engineering(China)

基　　金：山西省应用基础研究计划项目(201901D211024)。

摘　　要：为研究Cu纳米颗粒对VP-1导热油导热系数和黏度的影响,基于两相法一步制备十二烷基硫醇表面修饰的Cu/VP-1导热油纳米流体,研究30—130℃下不同质量分数纳米流体的导热系数和黏度变化规律。实验结果表明:添加分散剂可以改善纳米流体稳定性。在30—130℃纳米流体导热系数随温度、质量分数的增加而增大;黏度随温度升高呈指数降低,质量分数越高,黏度下降越缓慢。通过计算纳米流体在不同体积分数下的黏度和导热系数理论模型,对实验结果进行验证。Prasher模型能够准确预测纳米流体的导热系数,而现有的黏度模型不适用于Cu/VP-1导热油纳米流体,在修正现有的黏度模型基础上,提出新的黏度计算公式。To study the effect of Cu nanoparticles on the thermal conductivity and viscosity of VP-1 therminol,Cu/VP-1 therminol nanofluid modified with dodecyl mercaptan was prepared by one step based on the two-phase method.The variation law of thermal conductivity and viscosity of nanofluids with different mass fractions were studied under 30-130℃.The experiment result shows that adding a proper dispersant and adjusting pH of the reducing agent to 3 can improve the stability of the nanofluid.The thermal conductivity of nanofluids increases with the increase of temperature and mass fraction in the range of 30-130℃;the viscosity decreases exponentially with the increase of temperature,and the higher the mass fraction,the slighter the viscosity decrease.The experimental results are verified by calculating nanofluids′viscosity and thermal conductivity theoretical models under different volume fractions.The Prasher model can accurately predict the thermal conductivity of nanofluids,but the existing viscosity model is not suitable for Cu/VP-1 therminol nanofluid.A new viscosity calculation formula is proposed based on the modification of revising the existing viscosity model.

关 键 词：纳米流体 稳定性 导热系数 黏度 理论模型 

分 类 号：TK513.1[动力工程及工程热物理—热能工程]