The thermal performance analysis of a radiator was tested with three different types of nanoparticles: cylindrical (CNT)-platelet (graphene), spherical (SiC), and a hybrid fluid based on spherical (SiC) and cylindrical (CNT) composition. The experimental conditions included a coolant flowrate (CFR) of 7.1 L/min, an air velocity of 12.8 m/s, and a volume fraction of 1.6% hybrid nanofluid (HNF). An improvement in the exergy-energy performance of radiators was observed when coolants made of HNFs were used. Researchers found that when tested with different CFR and air velocities, spherical (SiC)-platelet (graphene) HNFs performed better than cylindrical (CNT)-platelet (graphene) hybrids. The irreversibility, second law efficiency, and energy change are all affected by the shape of the particles, and this effect becomes more pronounced as the air velocity and volume percentage of the HNF increase. The spherical (SiC)-platelet (graphene) HNF outperforms its cylindrical (CNT)-platelet (graphene) counterpart in terms of performance index (PI), exergy changes in coolant efficiency (3.9%), and second law efficiency (1.44%). According to the findings, the shape of the nanoparticles significantly affects how well a car radiator works. The spherical (SiC)-platelet (graphene) HNF outperforms other shapes when it comes to thermal performance, making it an excellent radiator coolant.

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