纳米粒子与石蜡乳状液复合多相功能热流体的制备与性能

以石蜡乳状液为分散介质，纳米Cu粒子为导热介质，采用相转化乳化法制备了纳米Cu/石蜡复合相变乳状液，研究了纳米Cu粒子对复合相变乳状液的稳定性、流变性、导热性和热循环稳定性的影响。研究结果表明：纳米Cu/石蜡乳状液的密度、粘度和导热系数均随纳米Cu含量的增大而增大，密度变化不太明显，而导热系数则明显提高，当纳米Cu粒子含量为0.05 wt%时，复合相变乳状液的导热系数比纯石蜡乳状液提高了161.96%。由于纳米Cu粒子的添加显著增加了Cu/石蜡乳状液的导热性能，Cu/石蜡乳状液在固−液相变热循环过程中的温度平台表现不明显，但其热循环稳定性很好。

Preparation and Properties of Multiphase Functionally Thermal Fluid

Copper nanoparticle/paraffin composite emulsions (CPC) was prepared by using phase transition emulsification method, in which the paraffin and copper nanoparticles are used as a dispersion medium and heat medium, respectively. The performances of stability, rheology, thermal conductivity, and thermal cycling stability of CPC are studied. The results show that the density, viscosity and thermal conductivity of CPC are increased with the increase of mass fraction of copper nanoparticles. Meanwhile, the density change is negligible, and the thermal conductivity is increased significantly with a large enhancement of 161.96% with a small mass fraction of 0.05 wt%. Since enhancement of the thermal conductivity, the phase change platform of nano-Cu/paraffin emulsion in the solid-liquid phase is not obvious during thermal cycling, but the thermal cycling stability is very good.