Nanofluids have been demonstrated to enhance the thermal properties of base fluids. Through the last two decades, researchers have shown that adding nanoparticles to existing coolant fluids can enhance their heat transfer performance. Conventionally water and ethylene glycol are used as engine radiator coolants. The addition of ethylene glycol is needed to increase the boiling point of the coolant and decrease the freezing point. This is a requirement for vehicles that are being used under harsh weather conditions. The downside of this is a loss in thermal conductivity and hence loss in efficiency of the vehicle.
Nanofluids have found great many applications in the past decade. As many researchers have shown, they can be used to enhance radiator performance as well. In this review paper, studies of heat transfer performance of various Nanofluids as engine coolants conducted by researchers are studied. Finally, a conclusion is presented.