准稳态法测量纳米颗粒悬浮液的热物性

通过添加亲水性分散剂,经超声振动制备了粒径为50 nm CuO纳米颗粒悬浮液。理论和实验分析了运用准稳态法测量纳米颗粒悬浮液有效导热系数和比热容等热物性的可行性。加热密度为100～500 W/m~2时,热物性测量结果的合理性和重复性都较好;而加热密度较小时离散性较大。实验表明,常温下2~(wt)％的CuO纳米颗粒悬浮液的有效导热系数约为纯水的1.08倍,比热容约为纯水的1.02倍。

THERMOPHYSICAL PROPERTIES MEASUREMENTS OF NANOPARTICLE SUSPENSION USING QUASI-STABLE STATE METHOD

The 50 nm CuO nanoparticle suspension is prepared by supersonic oscillator with hy-drophilic dispersant SDBS. The feasibility of using quasi-steady state method for the measurements of effective thermal conductivity and specific heat of nanoparticle suspension is discussed theoretically and experimentally. The reproducibility is good when the heat flux is 100-500 W/m2, while the divergency increased with the decrease of heat flux. The experiments have shown that the effective thermal conductivity and specific heat of 2wt% CuO nanoparticle suspension is about 1.08 and 1.02 times than that of pure water, respectively.