Article Title

Otomobil Radyatöründe Su Bazlı Grafen Nanoakışkan Kullanımının Isıl Verimliliğe Etkisinin Deneysel Olarak İncelenmesi


In this study, engine cooling performance of a Renault Clio automobile radiator (heat exchanger) by utilizing graphene water based nanofluids was studied. In the experiments the heat transfer increase were evaluated. In addition, the increase in pressure drop was investigated. Experiment set was designed similar to the engine cooling system. Four types of fluid were employed. These are water and nanofluids with (0.01-0.02-0.03) graphene nanoparticle concentration. In the experiment, the flow rate was adjusted between 4 and 16 l/min. The coolant inlet temperature to the vehicle radiator is 70 °C. Experiments were carried at the laminar flow. The Reynolds number is between 224 and 1482. Experiments were carried at the laminar flow. The best results were obtained by utilization nanofluid with 0.02% volumetric concentration of graphene. The enhancement in heat transfer rate was obtained 47%. A maximum enhancement in overall heat transfer coefficient was obtained up to 52%. The maximum increase in the nusselt number was 34%. The pressure drop increased by 49%. As a result, the high thermal efficiency was obtained by using nanofluid.Thermal efficiency was the maximum in the fluid experiment with a volumetric concentration of graphene of 0.02%.