Abstract
In this paper, an experimental investigation on the effects of hybrid nano-additives, composed of magnesium oxide (MgO) and functionalized multi-walled carbon nanotubes (FMWCNTs), on the thermal conductivity of ethylene glycol (EG) is presented. The experiments performed at temperatures ranging from 25°C to 50°C and the solid volume fraction range of 0–0.6%. The measurements revealed that the thermal conductivity of nanofluids significantly enhances with an increase in the percentage of the solid volume fraction. Moreover, the thermal conductivity of EG considerably increased with increasing temperature, while thermal conductivity of hybrid nanofluid slightly enhanced. The thermal conductivity measurements showed that the maximum enhancement of thermal conductivity of nanofluid is 21.3%, which occurred at solid volume fraction of 0.6% and temperature of 25°C. Finally, efforts were made to provide an accurate correlation for estimating the thermal conductivity at various temperatures and concentrations. Deviation analysis of the thermal conductivity ratio was performed. The comparison between experimental results and correlation outputs showed a good agreement.
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