Thermo-physical properties measurment of water based Fe3O4 nanofluids

Abstract

Two-step method was used to prepare nanofluids in which nanoparticles were first prepared and then dispersed in basefluid. This paper presents the effect of different volume fractions of magnetic Fe3O4 on thermal conductivity and viscosity of water based nanofluid. Thermal conductivity and viscosity of nanofluids having volume fractions in the range of 0.00375 - 0.1 were measured with KD2 Pro based on transient hot-wire method and AR-G2 rheometer respectively. The experimental results show that the thermal conductivity increases with an increase of particle volume fraction and are found that that they have noticeably 29 % higher thermal conductivities than the water. Viscosity of the nanofluid was found to be greater than the base fluid and it increased with the nanoparticle concentration in the base fluid. It was observed that shear rate has no effect on viscosity besides this all nanofluids composition showing Newtonian behavior and shear stress increases with increase in volume fraction.

Keywords

• nanofluid