在水基液中添加少量的纳米Cu颗粒(平均粒径为25nm),经超声波振荡和添加分散剂后,制备成分散稳定的Cu-H2O纳米流体.实验研究了纳米颗粒添加剂对水过冷度的影响,并采用红外热摄仪在线观察了纳米流体结晶过程的温度分布.结果表明.在水基液中加入纳米Cu粒子后,其过冷度明显降低,且随着纳米Cu质量分数的增加,流体的结冰时间缩短.Cu-H2O纳米流体的相变温度比水的提高了1℃,因此,纳米流体蓄冰时可以降低压缩机的输入功率,从而节约成本、减少能耗.
参考文献
| [1] | Seeniraj R V;Lakshmi Narasimhan N .[J].Journal of Solar Energy Engineering,2008,82(06):535. |
| [2] | Oliveira A C .[J].Journal of Solar Energy Engineering,2007,81(11):1361. |
| [3] | Akio S .[J].International Journal of Refrigeration-Revue Internationale du Froid,2002,25(02):177. |
| [4] | Li XF;Zhu DS;Wang XJ .Evaluation on dispersion behavior of the aqueous copper nano-suspensions[J].Journal of Colloid and Interface Science,2007(2):456-463. |
| [5] | Li XF;Zhu DS;Wang XJ;Wang N;Gao JW;Li H .Thermal conductivity enhancement dependent pH and chemical surfactant for Cu-H2O nanofluids[J].Thermochimica Acta: An International Journal Concerned with the Broader Aspects of Thermochemistry and Its Applications to Chemical Problems,2008(1/2):98-103. |
| [6] | 李新芳,朱冬生,王先菊,汪南,李华,杨硕.Cu-水纳米流体的分散行为及导热性能研究[J].功能材料,2008(01):162-165,169. |
| [7] | Thermal conductivities of naked and monolayer protected metal nanoparticle based nanofluids: Manifestation of anomalous enhancement and chemical effects[J].Applied physics letters,2003(14):2931-2933. |
| [8] | Wen DS;Ding YL .Experimental investigation into the pool boiling heat transfer of aqueous based gamma-alumina nanofluids[J].Journal of nanoparticle research: An interdisciplinary forum for nanoscale science and technology,2005(2/3):265-274. |
| [9] | Wen D S et al.[J].International Journal of Heat and Mass Transfer,2004,47:5181. |
| [10] | Xuan YM.;Li Q.;Hu WF. .Aggregation structure and thermal conductivity of nanofluids[J].AIChE Journal,2003(4):1038-1043. |
| [11] | Xuan YM.;Li Q. .Heat transfer enhancement of nanofluids[J].International journal of heat and fluid flow,2000(1):58-64. |
| [12] | Xie H Q;WangJ C;Xi T G et al.[J].Journal of Applied Physics,2002,91(07):4586. |
| [13] | Xie H Q;Wang J C;Xi T G et al.[J].Journal of Materials Science Letters,2002,21(19):1469. |
| [14] | 何钦波 .纳米流体相变蓄冷材料的热物性及小型蓄冷系统特性研究[D].重庆大学,2005. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%