纳米制冷剂TiO_2/HFC134a水平管内流动沸腾换热实验研究

Flow boiling heat transfer of nano-refrigerant TiO_2 and HFC134a mixtures in a horizontal tube

对纳米制冷剂TiO_2/HFC134a在水平管内的流动沸腾换热性能进行了实验研究,纳米颗粒的浓度为0.01、0.025和0.05 g·L^(-1),并与纯质HFC134a的结果相比较。结果发现:TiO_2/HFC134a工质的流动沸腾传热系数得到一定的强化,强化程度与颗粒浓度有关,实验过程中发现的纳米颗粒在换热表面的沉积可能是主要的影响因素。

In this paper,the flow boiling heat transfer characteristics of the TiO2 nanoparticles and HFCl 34a mixtures were investigated in a horizontal tube with the nanoparticles concentration of 0.01 g·L^(-1),0.025 g·L^(-1),0.05 g·L^(-1).The results indicated that nanoparticles increased the flow boiling heat transfer coefficient of the refrigerant,and the improvement was related to the nanoparticles concentration.The key factor may be the surface deposition characteristics.