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基于Maxwell电磁理论中电解质悬浮液中粒子质量分数和电导率之间的关系,提出了一种判定纳米流体悬浮稳定性的方法,并进行了实验验证。实验中,采用“两步法”经超声振荡制备了CuO/去离子水纳米流体。利用电导率仪测量了不同质量分数时纳米流体的电导率,建立了质量分数与电导率的关系,同时研究了温度对电导率的影响。结果表明电导率随着颗粒质量分数的增加而增加,随着质量分数的减小而减小;随着温度的增长,电导率只有微小变化,可以忽略温度对电导率的影响。
Based on the relationship between the particle mass fraction and the conductivity in the electrolyte suspension in Maxwell’s electromagnetic theory, a method to determine the suspension stability of nanofluids was proposed and verified by experiments. In the experiment, CuO / deionized water nanofluid was prepared by ultrasonic vibration using “two-step method ”. The conductivity of nanofluids at different mass fractions was measured by conductivity meter, and the relationship between mass fraction and conductivity was established. Meanwhile, the influence of temperature on conductivity was also studied. The results show that the conductivity increases with the increase of particle mass fraction and decreases with the decrease of mass fraction. With the increase of temperature, the conductivity changes only slightly, and the effect of temperature on conductivity can be neglected.