Stability and Thermal Conductivity Enhancement Dependent Chemical Surfactant For TiO2-H2O Nanofluid
Nano.uid is a new engineering material consisting of nanometer-sized particles dispersed in traditional heat transfer fluid. It has been attractive in recent years because of the enormous potential to improve the heat transfer efficiency. This study focuses on the effect of sodium dodecyl sulfate (SDS) surfactant on the stability and thermal conductivity of TiO2-H2O nanofluid. The particle size of the suspended particles was measured by Nanotrac analyzer, and the thermal conductivity was measured by Nanoflash thermal constants analyzer. The results indicate that the stability of nanofluids had a good corresponding relation with the thermal conductivity. The stability and thermal conductivity enhancements of TiO2-H2O nanofluid are highly dependent on SDS dispersant concentration. In the present study, the 0.35wt％ SDS can be regarded as an optimal concentration to obtain the best dispersion and the highest thermal conductivity for the 0.7wt％ TiO2-water nano.uid. The experimental results of thermal conductivity were higher than the values that calculated by the Hamilton-Crosser model. Therefore, the treatment with chemical surfactant is recommended to improve the stability and the thermal conductivity for practical applications of nanofluids.
Nanofluid Stability Thermal conductivity SDS
Xing Li Ying Chen Songping Mo Jieying Yang
Faculty of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China
国际会议
4th International Symposium on Heat Transfer and Energy Conservation(第四届传热与节能国际研讨会 ISHTEC2012)
广州
英文
1-4
2012-01-06（万方平台首次上网日期，不代表论文的发表时间）