Measurement of the thermal conductivity of titania and alumina nanofluids
2012
Yiamsawasd, Thakleaw | Dalkilic, Ahmet Selim | Wongwises, Somchai
This article reports the thermal conductivity of nanofluids experimentally. TiO₂ and Al₂O₃ nanoparticles were suspended in base fluids (water and 20/80 by mass of an ethylene glycol–water mixture) with concentration level of 0–8vol.%, at a temperature of 15–65°C. The measurement was done by the transient hot-wire method. The results showed that thermal conductivity of nanofluids increased more with respect to the base fluid and increased with increasing concentration and temperature. When compared with predictions from existing models, thermal conductivity ratio could not be predicted by the models in terms of both concentration and temperature. Finally, a useful correlation for predicting thermal conductivity of Al₂O₃ and TiO₂ nanofluids was presented.
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