采用“两步法”制备出不同浓度的TiO2-H2O纳米流体，选用紫外分光光度法对纳米流体的分散稳定性进行了评价，使用差示扫描量热仪对纳米流体以及基液一去离子水的固液相变过程进行了测试。实验结果表明：纳米流体的分散稳定性随着TiO2粒子质量浓度的增大先增强后减弱；添加纳米颗粒可以促进去离子水的异质成核，减小其固液相变过冷度；随着纳米流体质量浓度的增大，过冷度先减小后增大、固液相变时间和相变潜热则先增加后减少。分析得出：纳米流体的分散稳定性越好，其发生固液相变所需的过冷度越小，相变时间越长，释放的相变潜热越多。
TiO2-H2O nanofluids were prepared by a two-step method. Their dispersion stabilities and solid-liquid phase change properties were measured by ultraviolet spectrophotometer and differential scanning calorimeter （DSC）, respectively. The results showed that nanofluids＇ stabilities were first increased and then decreased as concentrations of TiO2 nanoparticles increased. Their supercooling degrees were all lower than that of deionized water （DW）, which suggests that addition of TiO2 nanoparticles can promote heterogeneous nucleation in DW and reduce the supercooling degree. Nanofluids＇ supercooling degrees were decreased first and then increased, transformation time and latent heat were both increased first and then decreased as concentrations increased. It was found that the better dispersion stability of the nanofluid, the lower the supercooling degree and the more latent heat can be obtained.
参考文献
| [1] | Hideo Inaba;Takaaki Inada;Akihiko Horibe;Hiroshi Suzuki;Hiromoto Usui .Preventing agglomeration and growth of ice particles in water with suitable additives[J].International Journal of Refrigeration,2005(1):20-26. |
| [2] | Xu Zhang;Takaaki Inada;Akira Yabe;Shushen Lu;Yoshiyuki Kozawa .Active control of phase change from supercooled water to ice by ultrasonic vibration 2. Generation of ice slurries and effect of bubble nuclei[J].International Journal of Heat and Mass Transfer,2001(23):4533-4539. |
| [3] | 唐恒,章学来,王海民.基于冰晶结构的二元冰蓄冷系统中添加剂的研究[J].制冷空调与电力机械,2005(01):33-35. |
| [4] | Hiki Hong;Jong Hyeon Peck;Chaedong Kang .Ice adhesion of an aqueous solution including a surfactant with stirring on cooling wall: ethylene glycol - a silane coupling agent aqueous solution[J].International Journal of Refrigeration,2004(8):985-992. |
| [5] | Koji Matsumoto;Masashi Okada;Tetsuo Kawagoe;Chaedong Kang .Ice storage system with water-oil mixture formation of suspension with high IPF[J].International Journal of Refrigeration,2000(5):336-344. |
| [6] | 何钦波,童明伟,刘玉东.低温相变蓄冷纳米流体成核过冷度的实验研究[J].制冷学报,2007(04):33-36. |
| [7] | 李新芳,朱冬生.纳米流体强化相变蓄冷特性的实验研究[J].材料导报,2009(06):11-13,16. |
| [8] | 蔡艳华,马冬梅,王金刚,俞海军,朱根华.纳米流体的制备及传热性能研究的现状[J].材料研究与应用,2007(04):274-276. |
| [9] | 张卫英,李秋,褚文评,李晓,董声雄.乳液聚合法合成水杨酸分子印迹聚合物微球[J].化工学报,2008(06):1551-1555. |
| [10] | M.Joshi;B.S.Butola .Studies on nonisothermal crystallization of HDPE/POSS nanocomposites[J].Polymer: The International Journal for the Science and Technology of Polymers,2004(14):4953-4968. |
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