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D. Tirupathi Rao, S.Ravibabu ‘Experimental investigation of cooling performance of an Automobile radiator using Al2O3 Water+ethylene Glycol nanofluid
Improving The Cooling Performance Of Automobile Radiator With Al2O3/Water Nanofluid (2011)
Experimental Investigation Of Cooling Performance Of An Automobile Radiator Using Al2o3-Water+Ethylene Glycol Nan fluid (2015)
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A Comparative Study On Thermal Conductivity Of Al2o3/Water, Coo/Water And Al2o3 –Cuo/Water Nanofluids (2015)
Investigation on Physical Properties of Al2O3/Water Nano Fluid (2015)
Performance Investigation Of Automobile Radiator Using Al2O3 As Base Nan fluid (2016)
In this paper pure water and water based Nanofluid coolant are used in automobile radiator for measuring heat transfer coefficient at different concentration and temperature. Nanofluid has better thermo physical properties & higher thermal conductivity so higher heat transfer coefficient, and by using nanofluid because of this radiator of reduced size can be used for same amount of heat removal which ultimately responsible for better car performance and increased fuel economy. The higher % of particle of Al2O3 in water can increase the heat transfer rate of automobile radiator. This paper highlights the two step method used for preparation of nanofluid- Al 2 O 3 - Water+Ethylene Glycol prepared by two step method. In two step method 10.5litres of distilled water mixed with 4.5 liters of ethylene glycol and it is used as based fluid. Oscar ultra sonicator is used for preparation of nanofluid. Al 2 O 3 nanoparticle in water+ethylene glycol base solution increase the heat transfer rate of radiator. The degree of heat transfer increases depends on the amount of nano particle mixed with the water+ethylene glycol. CuO/water & Al 2 O 3 /water have better thermophysical properties. CuO has higher density & thermal conductivity than Al 2 O 3 . But CuO was not concluded as economical alternative. Percentage volume concentration formula given in this paper.
Study Of Heat Transfer Characteristics Of Nano Fluid In An Automotive Radiator (2018) Different volume concentration is used to calculate thermal conductivity of nanofluids. Thermal conductivity varies with temperature and volume concentration was studied. In this paper we studied different physical properties of Al 2 O 3 water nanofluid and experimentally investigated the effective thermal conductivities and viscosity of nanofluid. The equipment called KD2 thermal property analyzer uses to measure thermal conductivity and thermal resistivity. The KD2 analyzer also calculate thermal data and display thermal conductivity in 90 just seconds. It showed the thermal conductivity of Al 2 O 3 nanofluids increases with a partial volume concentration & the viscosity of nanofluid depend on volume percentage. The electrical conductivity is higher than best fluids available as coolant. This paper concluded that nanofluid having better heat transfer rate as compare to other coolant. Heat transfer rate increases with the temperature increases. Because of higher heat transfer rate in radiator we can use compact sized radiator for same coolant and this reduced frontal area of automobile and it result in reduced aerodynamic drag and ultimately increase fuel economy. In this paper detail procedure for preparation of nanofluids is explained. Nanofluid preparation done by two step method, which involve the use of Ultrasonic Sonicator for Mechanical Vibration which tends to dissolve nanoparticle in the base fluid. Followed by Mechanical Exciting to fluid to dissolve the denser particles. And eventually the use of Magnetic Stirrer to obtain a homogeneous mixture of Al 2 O 3 nanoparticles with base fluid. By virtue of experimentation the overall heat transfer coefficient, Nusselt number and Reynolds number increase with coolant flow rate which gives higher heat transfer rate compare to base fluids. It is concluded that nanofluid has higher heat transfer properties than other base fluid like water and ethylene glycol and good economy.
