Experimental and ANN-Levenberg-Marquardt Predictions of the Thermophysical Properties of CoFe2O4/Water Nanofluids.

This paper explains about the determination of thermal conductivity, viscosity, density, and specific heat of water dispersed CoFe2O4 nanofluids experimentally. The obtained data was undergone with ANN-Levenberg-Marquardt algorithm. The utilized CoFe2O4 nanoparticles were synthesized through the chemical coprecipitation method. The obtained CoFe2O4 nanoparticles were characterized with different techniques. The properties were measured under 20°C to 60°C, and under 0.25% to 1.25% vol, respectively. The experimental results show, under the particle volume loading of 1.25%, the thermal conductivity value was raised by 27.56% at a temperature of 60°C, and the viscosity was increased by 49.36% at a temperature of 20°C, over the base fluid. Likewise, the density of nanofluids were increased and the specific heat of nanofluids were falls down over the base fluid. Results were also showing, the utilized ANN-Levenberg-Marquardt algorithm has good agreement with the obtained data. Based on Levenberg-Marquardt, the R2 coefficient of thermal conductivity, viscosity, density, and specific heat values are 0.99802, 0.99217, 0.98684, and 0.99948, respectively. [ABSTRACT FROM AUTHOR]