Akademik Veri Yönetim Sistemi
Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.39, sa.1, ss.17-28, 2023 (SCI-Expanded)
It is possible to increase the heat conduction in the engine by mixing nano-sized metal particles into the liquid coolant. In this study, the temperature changes in the cooling system of the engine operated at 1000, 2000, 3000, and 4000 rpm were investigated by adding 0.1% and 0.2% SiO2, TiO2, Al2O3 nanofluids to the base coolant in the engine cooling system of a vehicle. In addition, the changes in CO2, HC, CO, NOx, and O2 exhaust emissions at these speeds were also investigated. It was observed that the heat conduction increased as the ratio of nanofluids added to the base fluid increased, but the heat conduction decreased at 3000 and 4000 rpm. The positive heat conduction effect seen in all nanofluid mixtures studied for low-temperature values was not observed when the coolant temperature values increased with the increase in engine speed. Therefore, it was determined that nanofluid mixtures did not improve heat conduction under all conditions. With the increase in the particle ratio, it has observed that the engine coolant remained at lower temperature values, resulting in an improvement in heat conduction. For CO2, HC, CO, and O2 emissions, there were no significant differences in the exhaust emission values compared to the base fluid. It has been determined that there are decreases of approximately 28%, 27%, 25%, and 21%, respectively, in NOx emission values for different engine speeds. In general, the best results in temperature and emission measurements were obtained with 0.2% SiO2 nanofluid.