Abstract
In this study, the thermal performance of vehicle’s cooling system is experimentally investigated using the water/coolantbased Al2O3 nanofluids as working fluids. For the purpose, the water/coolant-based Al2O3 nanofluids are prepared by twostep method with gum arabic. In order to obtain the well-suspended nanofluids, the agglomerated Al2O3 nanoparticles are precipitated using centrifugal force and the experiments are performed with supernatant of them. The thermal conductivity is measured by transient hot wire method and the thermal conductivity of nanofluids is enhanced up to 4.8% as compared to that of base fluids. Moreover, the cooling performance of water/coolant-based Al2O3 nanofluids is evaluated using vehicle’s engine simulator under the constant RPM condition. The results show that the cooling performance of automobile engine increases up to 5.9% using prepared nanofluids. To investigate the effect of nanofluids on exhaust gas, the NOx emission is measured during the operation with respect to time and 10.3% of NOx emission is decreased. The experimental results imply that the water/coolant-based Al2O3 nanofluids might be used as a next-generation vehicles’ coolant
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