Abstract
In this article, an experimental work was carried out to investigate the thermal conductivity of CuO/water and Al2O3/water nanofluids with and without surfactants. Three different volume concentrations of nanofluids (0.05, 0.1 and 0.2%) prepared by using single step preparation method. Sodium dodecylbenzene sulfonate used as a surfactant in this study. The analysis is carried out on the effects of sonication time and thermal conductivity of the prepared nanofluids by varying temperature from 30°C to 60°C. The obtained results indicate that the thermal conductivity of nanofluids increased with an increase of sonication time, temperature and the amount of surfactant. Also, the maximum thermal conductivity value was obtained for 0.2% volume concentration of CuO/water nanofluid with SDBS surfactant.
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