The Effect of Magnetic Field Amplitude on the Convective Heat Transfer Coefficient of Magnetite Nanoparticles Based on Various Fluids

In the present contribution, we prepared the magnetite nanoparticles by using the solvothermal technique forfurther enhancement of heat transfer properties under the influence of an AC magnetic field. TEM photograph confirmedthe formation of highly dispersed cluster-like nanoparticles, owing mean particle size of around 75 nm. Also, XRDspectrum showed that magnetite nanoparticles were composed of ca. 6-nm crystallites. According to VSM analysis, Fe3O4nanoparticles were found to have superparamagnetic characteristics. Heat transfer properties of the examined magnetitenanofluids based on various concentrations of water and EG were considerably enhanced under the influence of analternating magnetic field. According to the findings, more vigorous Brownian relaxation at higher field amplitudes wasresponsible for the enhancement of h values

کلیدواژه ها:

Heat transfer coefficient ، Magnetic nanofluid ، Hyperthermia ، Neel relaxation ، Brownian relaxation