Improve the thermal conductivity of 10w40-engine oil at various temperature by addition of Al2O3/Fe2O3 nanoparticles

Oils are used as coolants and lubricants in different industrial systems with the aim of reducing friction between parts and their abrasion. The objective of the present study was to investigate the effect of addition of Al2O3-Fe2O3 Nano powder hybrid on the thermal properties of 10w40 engine oil. In this study, the effect of nanoparticle concentration at different mass fractions (0, 0.25, 0.5, 1, 2, and 4) was examined. Experiments were conducted within a temperature range of 25-65 degrees C. The nano-lubricant was prepared using the two-stage method. An ultrasonic probe was used for 45 min to uniformly distribute the nanoparticles in the base fluid. The thermal conductivity coefficient of the hybrid nanofluid was measured using the KD2-Pro thermal analyzer, the results of which indicated that even the smallest mass concentration improved the thermal properties of the nano-lubricant. Accordingly, the largest improvement occurred at a mass fraction of 4%, i.e. 33% of the base oil. In order to calculate the thermal conductivity of the nano-lubricant using the temperature and mass fractions of the particles, the curve fitting method was applied to the experimental data to find a highly accurate experimental relation in SigmaPlot V12. (C) 2019 Published by Elsevier B.V.