Journal of South China University of Technology (Natural Science Edition) ›› 2008, Vol. 36 ›› Issue (11): 7-11.

• Chemistry & Chemical Engineering • Previous Articles     Next Articles

Thermal Conductivity of Al2O3-H2O Nano-Fluid

Zhu Dong-sheng1  Li Xin-fang2  Wang Nan1  Wang Xian-ju1  Li Hua1  Yang Shuo1   

  1. 1. Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education, South China University of Technology, Guangzhou 510640, Guangdong, China; 2. Zhongshan Torch Polytechnic College, Zhongshan 528436, Guangdong, China
  • Received:2007-10-22 Revised:2008-01-08 Online:2008-11-25 Published:2008-11-25
  • Contact: 朱冬生（1964-），男，教授，博士生导师，主要从事强化传热、节能和制冷研究及应用． E-mail:cedshzhu@scut．edu．cn
  • About author:朱冬生（1964-），男，教授，博士生导师，主要从事强化传热、节能和制冷研究及应用．
  • Supported by:

    国家自然科学基金资助项目（20346001）;高等学校博士学科点专项科研基金资助项目（20050561017）;教育部新世纪优秀人才支持计划项目（NCET-04-0826）;中国博士后基金资助项目（20060400219）

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Abstract:

The thermal conductivity of Al2O3-H2O nano-fluid was measured using a Hotdisk thermophysical analyset, and the effects of pH value, dispersant concentration and nano-particle content （ mass fraction） on the thermal conductivity were investigated. The results show that, when the pH value and the dispersant dosage are both optimal, the absolute value of surface Zeta potential of Al2O3-H2O nano-fluid in aqueous solution significantly improves, thus increasing the electrostatic repulsive force among particles and resulting in better dispersion behavior and higher thermal conductivity of the nano-fluid. Moreover, it is found that pH 8.0 favors the dispersion behavior and the thermal conductivity, that the optimized content of sodium dodecylbenzenesulfonate is 0. 10% for 0. 10% Al2O3-H2O nano-fluid, and that the thermal conductivity of Al2O3-H2Onano-fluid, which is higher than that calculated based on the Hamilton-Crosser model, nonlinearly increases with the mass fraction of nano-particles.

Key words: nano-alumina, nano-fluid, Zeta potential, thermal conductivity