Investigation on Characteristics of Thermal Conductivity for Al2O3-H2O Nanofluids
Nanofluids have been attractive for the last few years with the enormous potential to improve the efficiency of heat transfer fluids. In this study, the thermal conductivity of Al2O3-water nanofluids was measured by a Hot Disk Thermal Constants Anlyser, and the effects of pH value, sodium dodecylbenzenesulfonate (SDBS) concentration and nanoparticle concentration on the thermal conductivity of Al2O3 nanoparticles in deionized water were discussed. The results showed that the thermal conductivity enhancements of Al2O3-water nanofluids are highly dependent on pH values, the weight fraction of nanoparticle and SDBS dispersant concentration of nano-suspensions. The Al2O3-water nanofluids with an ounce of Al2O3 have noticeably higher thermal conductivity than the base fluid without nanoparticles, For Al2O3 nanoparticles at a weight fraction of 0.0015 (0.15 wt ％), thermal conductivity was enhanced by up to 10.1％, with an optimal pH value and SDBS concentration for the highest thermal conductivity. Therefore, the combined treatment with both the pH and chemical dispersant is recommended to improve the thermal conductivity for practical applications of nanofluid.
Nanofluid Alumina nanoparticle Zeta potential Thermal conductivity
李新芳 朱冬生 汪南 王先菊 高进伟 李华
华南理工大学 化工与能源学院 传热强化与过程节能教育部重点实验室,广东广州510641 华南理工大学 化工与能源学院 传热强化与过程节能教育部重点实验室,广东广州510641;海军兵种指挥学院,广东 广州 510431
国际会议
成都
英文
2007-11-19（万方平台首次上网日期，不代表论文的发表时间）