Thermal conductivity of ethylene glycol and water mixture based Fe_3O_4 nanofluid

摘要

Thermal conductivity of ethylene glycol and water mixture based Fe_3O_4 nanofluid has been investigated experimentally. Magnetic Fe_3O_4 nanoparticles were synthesized by chemical co-ptecipitation method and the nanofiuids were prepared by dispersing nanoparticles into different base fluids like 20:80%, 40:60% and 60:40% by weight of the ethylene glycol and water mixture. Experiments were conducted in the temperature range from 20℃ to 60℃ and in the volume concentration range from 0.2% to 2.0%. Results indicate that the thermal conductivity increases with the increase of particle concentration and temperature. The thermal conductivity is enhanced by 46% at 2.0 vol.% of nanoparticles dispersed in 20:80% ethylene glycol and water mixture compared to other base fluids. The theoretical Hamilton-Crosser model failed to predict the thermal conductivity of the nanofluid with the effect of temperature. A new correlation is developed for the estimation of thermal conductivity of nanofiuids based on the experimental data.