Materials Reports  2021, Vol. 35 Issue (Z1): 116-120 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Analysis on Thermal Conductivity Mechanism of SiO2-H2O Nanofluids |
| LIU Gang, JIA Lisi, CHEN Ying, WANG Jiacheng, MO Songping
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| School of Materials and Energy,Guangdong University of Technology, Guangzhou 510006, China |
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Abstract SiO2 nanoparticles with different sizes (50 nm and 500 nm) were added into the deionized water by a “two-step” method to prepare water-based nanofluid, and the dispersion stability of SiO2-H2O nanofluids was evaluated using a photometric dispersion analyser. The results showed that the instability index values of SiO2-H2O nanofluids were lower than 0.37, suggesting that SiO2 nanoparticles were stably dispersed in the deionized water. The thermal conductivities of SiO2-H2O nanofluids at 25 ℃ and -20 ℃ were measured by a hot-disk method, and the effect of nanoparticle concentration and size was investigated detailedly. The results showed that as the concentration of SiO2 nanoparticles increased or the size of SiO2 nanoparticle decreased, the thermal conductivity of SiO2-H2O nanofluids at 25 ℃ increased, whereas that of SiO2-H2O nano-fluids at -20 ℃ decreased due to the lower thermal conductivity of SiO2 nanoparticles compared with the ice. The Maxwell, Bruggeman, Yu and Choi, and Xie models were adopted to calculate the thermal conductivities of SiO2-H2O nanofluids at 25 ℃ and -20 ℃. The calculated and mea-sured values were compared to further investigate the mechanism of thermal conductivity of SiO2-H2O nanofluids. The results showed that these models could predict the thermal conductivities of SiO2-H2O nanofluids at -20 ℃, whereas the deviations between theoretical and experimental values of thermal conductivity at 25 ℃ were distinct. It suggested that the thermal conductivity of SiO2-H2O nanofluids was affected by the intrinsic thermal conductivity and Brownian motion of nanoparticles, and the Brownian motion of nanoparticles played a dominant role in particular.
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Published: 16 July 2021
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| Fund:National Natural Science Foundation of China (51876045). |
| About author:: Gang Liu, graduate student of Guangdong University of Technology. He obtained a bachelor of engineering from Zhuhai College of Beijing Institute of Technology in Sep. 2013—Jun. 2017. His main research direction is the thermophysical properties of particle suspensions.Lisi Jia graduated from Chongqing University in 2014 with a Ph. D. of engineering. She is now an associate professor in the School of Materials and Energy, Guangdong University of Technology. She is engaged in the research of heat transfer enhancement techniques, and has published more than 30 academic papers. |
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