二元冰蓄冷系统中的纳米添加剂成核特性研究

为了获得蓄冰溶液中纳米成核添加剂的选择标准,选择在纯净水和乙二醇溶液两种不同的基体溶液中添加两类不同的纳米微粒（SiO₂和α-Al₂O₃）进行实验,观察得到了不同的成核效果.以相关润湿机理为基础,对实验结果进行初步分析后表明:不同质量分数的添加剂具有不同的成核效果；当纳米微粒添加到乙二醇溶液中时,由于两者润湿效果较差,从而导致微粒成核效果下降,混合溶液过冷解除温度下降,增加制冰能耗,因此添加剂颗粒与基体溶液的润湿性将严重影响其结冰成核效果,润湿性能越好,成核效果越好．

Nucleation characteristics of nano-additives in binary ice thermal storage system

Adding two different nanoparticles (SiO2 and α-Al2O3) into the pure water and the ethylene glycol solution respectively to obtain the choosing principle of the nucleation nano-additives mixed with the ice making solution of the cold storage system.  Different effects were observed. And the crystallization mechanism was analyzed based on the theory of wettability involved. The experimental and analytical results show that the same additives of different mass fraction have the different nucleation effects; and when the nano-additives mixed with the ethylene glycol solution, the poor wettability between them results in the poor nucleation, the lower temperature of the supercooling rupture, and the larger energy consumption, so the wettability between the additives and the basic fluid plays an important role in crystallization, and the better wettability results in the better nucleation．