Rouhollah YadollhiFarsani - Department of Mechanical Engineering, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
Afrasiab Raisi - Faculty of Engineering, Shahrekord University, Shahrekord, Iran
Afshin Ahmadi Nadooshan - Faculty of Engineering, Shahrekord University, Shahrekord, Iran

Liquid paraffin as a coolant fluid can be  applied in electronic devices as a result to its suitable capabilities such as electrical insulating, high heat capacity, chemical and thermal stability, and high boiling point. However, the poor thermal conductivity of paraffin has been confined its thermal cooling application. Addition of high conductor nanoparticles to paraffin can fix this drawback properly. In this article, the influence of the nanoparticles on the thermal conductivity of base material was assessed. Temperature (۲۰-۵۰°C) and volume fractions (۰-۳%) effect on the thermal conductivity of paraffin/alumina nanofluids have been considered. Nanofluid samples were prepared applying the two-step method. The thermal conductivity was measured by a KD۲ pro instrument. The results indicated the thermal conductivity augments smoothly with an increase in volume fraction of nanoparticles as well as temperature. Moreover, it observed that for nanofluids with more volume-fraction the temperature affection is more remarkable. Thermal conductivity enhancement (TCE) and effective thermal conductivity (ETC) of the nanofluid was calculated and new correlations were reported to predict the values of them based on the volume fraction of nanoparticles and temperature of nanofluid accurately.

Experimental correlation, Alumina, Liquid paraffin, Nanofluid