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强化传热期刊
影响因子: 0.562 5年影响因子: 0.605 SJR: 0.175 SNIP: 0.361 CiteScore™: 0.33

ISSN 打印: 1065-5131
ISSN 在线: 1026-5511

强化传热期刊

DOI: 10.1615/JEnhHeatTransf.v16.i2.10
pages 93-102

Thermal Conductivity Enhancement for Aqueous Alumina Nano-Suspensions in the Presence of Surfactant

Xinfang Li
Department of Packaging and Printing, Zhongshan Torch Vocation and Technology College, Zhongshan, Guangdong 528436, P.R. China
Dongsheng Zhu
Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemical and Energy Engineering, South China University of Technology, Guangzhou, Guangdong 510641, P.R. China
Xianju Wang
Navy Arms of Services Command Academy, Guangzhou, Guangdong 510431, P.R. China
Nan Wang
Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemical and Energy Engineering, South China University of Technology, Guangzhou, Guangdong 510641, P.R. China
Jinwei Gao
Key Laboratory of Enhanced Heat Transfer and Energy Conservation, Ministry of Education, School of Chemical and Energy Engineering, South China University of Technology, Guangzhou, Guangdong 510641, P.R. China

ABSTRACT

In this study, Al2O3-water nanofluids were synthesized, their thermal conductivity in water was investigated under different pH values and different sodium dodecylbenzenesulfonate (SDBS) concentrations. The thermal conductivity was measured by a Hot Disk Thermal Constants Analyzer. The results showed that the thermal conductivity enhancements of Al2O3-water nanofluids are highly dependent on the weight fraction of nanoparticles, pH values, and SDBS dispersant concentration of nano-suspensions. The Al2O3-water nanofluids with a small amount of Al2O3 have noticeably higher thermal conductivity than the base fluid without nanoparticles. For the Al2O3-H2O nanofluid with an optimal pH value and SDBS concentration, the thermal conductivity can be enhanced by more than 10% at a weight fraction of 0.0015. Therefore, the combined treatment with both the pH and chemical dispersant is recommended to improve the thermal conductivity for practical applications of nanofluid.