作　　者： ; ; ;

机构地区： 广东工业大学材料与能源学院

出　　处： 《Journal of Southeast University(English Edition)》 2010年第2期359-363,共5页

摘　　要： A water-TiO2nanofluid with a weight fraction of 5% and an average particle size of 75 nm is used to investigate the effect of TiO2 nanoparticles on the crystallization and melting behaviors of deionized water by using differential scanning calorimetry（DSC）at four different cooling rates,3,5,7,9 ℃/min.The DSC experimental results show that the water-TiO2 nanofluid has a lower supercooling degree and a faster crystallization rate than the deionized water.With the increase in the cooling rate,the influence of the TiO2 nanoparticles on the supercooling degree of the deionized water becomes greater,but on the crystallization rate it turns lower.During the melting process,compared with the deionized water,the water-TiO2 nanofluid has a lower melting temperature,a less latent heat and a higher melting rate. 以质量分数5%、平均粒径75nm的水基二氧化钛(TiO2)纳米流体为材料,利用差示扫描量热仪,分别在3,5,7,9℃/min4个冷却速率下研究了TiO2纳米粒子对去离子水结晶和熔化行为的影响.实验结果表明,与去离子水相比,水基TiO2纳米流体具有更低的过冷度和更快的结晶速率.随着冷却速率的增大,TiO2纳米粒子对去离子水过冷度的影响增强,对其结晶速率的影响则减弱.在熔化过程中,与去离子水相比,水基TiO2纳米流体具有更低的熔化温度、更小的熔化潜热和更大的熔化速率.

领　　域： [一般工业技术]