Water and ethylene glycol have been used as heat transfer fluids in automobile cooling systems for many years. However, these fluids have a low thermal conductivity coefficient. Therefore, a new heat transfer fluid,called nanofluid,has been studied recently. The aim of this study is to investigate the thermal performance of nanofluids used in automo-bile radiators experimentally and numerically.An automobile cooling system experimental setup was built for experimental work. ANSYS Fluent pro-gram, a Computational Fluid Dynamics software, was used in numerical analysis. In the analysis, dis-tilled water and ethylene glycol based fluids contain-ing Al,O,CuO and MgO nanoparticles were used as nanofluids. The analyses were carried out at three different volumetric flow rates(0.232 L/s,0.260 L /s.0.282 L/s)and three different air velocities(1.6 m/s,2.3 m/s,2.9 m/ s).According to the results obtained, it was observed that the convective heat transfer coefficient of nanofluids was higher than that of the base fluid under the same conditions. In addition, it was observed that the convective heat transfer coefficient of coolant fluids increases with increasing volumetric flow rate and air velocity. Ac-cording to the results obtained from experimental and numerical analysis, it was observed that the con-vective heat transfer coefficient of nanofluids con-taining Al2O3,CuO and MgO was 21-74%,20-47%and 1-13%higher than that ofthe base fluid, respec-tively.
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