Abstract— Nano fluids are having wide area of applications in heat transfer equipments. In the present work graphene nanoparticles, Dispersed in De-ionized water (DI), Ethylene Glycol (EG) based nano fluids were developed. Thermal conductivity and convective heat transfer properties of these nanofluids were systematically investigated. In the present investigation thermal convection of glycol based nanofluids with different volumetric concentrations and fractions is experimentally determined in the temperature range of 30 °C to 80 °C graphene nano particles with average particle size of 11 nm-15 nm is used for the preparation of glycol based nano fluids. Basefluid used in the present investigation is 70% water and 30% ethylene glycol by weight. Thermal convection of graphene nano fluids is measured for different volume concentrations in the range of 0.2%-1.0% of nano particles. Based on the experimental results It is concluded that thermal convection of graphene nanofluids considered in the present investigation increases with increase in percentage of volume concentrations of graphene particles at different temperatures. These results provide insights in the increase of convective heat transfer in the base fluid temperatures.

Index Terms— Thermal convection, Ethylene glycol + water, Graphene nano particles, Graphene nano fluid, Base fluid

Cite: K Dilip Kumar and B Uma Maheswar Gowd, " Convective Heat Transfer Characteristics of Graphene Dispersed Nano Fluids," International Journal of Mechanical Engineering and Robotics Research, Vol. 1, No. 2, pp. 250-260, July 2012.