Cu-水纳米流体对流换热特性研究  

Enhanced Convection Heat Transfer Characteristics of Cu-H_2O Nanofluids

作　　者：李新芳[1] 朱冬生[2] 

机构地区：[1]中山火炬职业技术学院,中山528436 [2]华南理工大学传热强化与过程节能教育部重点实验室,广州510641

出　　处：《真空科学与技术学报》2010年第3期297-301,共5页Chinese Journal of Vacuum Science and Technology

基　　金：教育部优秀人才支持计划(No.NCET-04-0826)资助项目;中国博士后基金(No.20060400219)资助项目

摘　　要：建立了测量纳米流体流动与对流换热性能的实验系统,探讨了不同pH值、分散剂浓度和纳米粒子质量分数对Cu-水纳米流体对流换热性能的影响。结果表明:pH值对Cu-水纳米流体对流换热系数的影响较小,这个现象启发了我们将纳米流体应用到未来工业中,可以不考虑pH值对纳米流体对流换热性能的影响。分散剂加入量是影响Cu-水纳米流体对流换热系数的重要因素,从分散稳定、导热系数和对流换热系数提高三个方面来考虑,在0.1%Cu-H2O纳米流体中,0.07%十二烷基苯磺酸钠被选为最优化浓度。另外,Cu-水纳米流体的对流换热系数随纳米粒子质量分数的增大而增大,但其对流换热系数的增加明显低于导热系数的增加。The dedicated system was designed and built to evaluate the convection heat transfer and flow characteris- tics of the Cu-H2o nanofluids. The impacts of experimental conditions, including the pH values, disperant concentration of sodium lanryl benzenesulfate （SDBS） and copper nano-particle distributions, on the convection heat transfer and flow characteristics were studied. The results show that the SDBS concentration affects the characteristics more strongly than the pH value does, indicating pH can be neglected in future industrial applications. When the combined effect of the dispersion, thermal conductivity and heat transfer were considered, 0.07 % SDBS is an optimized concentration for the 0.1% Cu-H20 nanofluid. In addition, the weight fraction of copper nano-particle considerably enhances the heat transfer coetfficient, which is lower than the related conductivity enhancement.

关 键 词：Cu-H2O纳米流体 对流换热 PH值 分散剂 

分 类 号：TK124[动力工程及工程热物理—工程热物理]