Experimental study of preparing the CoFe2O4 magnetic nanofluid and measuring thermal-fluid characteristics of the stabilized magnetocaloric nanofluid

• Published in: Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2024-08, Vol.306, Article 117462
• Main Authors: Abbasian, Ahmad Reza, Razavi Dehkordi, Mohammad Hossein, Azimy, Noushin, Azimy, Hamidreza, Akbari, Mohammad, Ayadi, Badreddine, Aich, Walid, Kolsi, Lioua
• Format: Article
• Language: English
• Subjects: CoFe2O4 nanoparticles; Dynamic viscosity; Magnetocaloric nanofluids; Rheological properties; Thermal conductivity; Thermal-fluid properties
• ISSN: 0921-5107; 1873-4944
• DOI: 10.1016/j.mseb.2024.117462

•Thermal conductivity and dynamic viscosity of a superparamagnetic nanofluid were analyzed.•Temperature growth leads to the significant reduction of dynamic viscosity by up to 78.7%.•Increasing the mass concentration from 0.05% to 0.8% results in about 74% increase in viscosity.•Thermal conductivity has increased to a maximum of 9.4 % at 50 °C. The purpose of this study was to examine the rheological features of CoFe2O4 superparamagnetic nanoparticles dispersed in water-ethylene glycol (EG) coolant as the basis fluid. The experiments are carried out at temperatures between 10 and 50 degrees Celsius, with five mass fraction concentrations of magnetocaloric nanofluid as well as different shear rates. The solvothermal-produced cobalt ferrite metallic compounds are disseminated in EG-water (50:50) coolant. Evaluation of functional groups and organic compounds, the crystal structure of spinel ferrite, the size and morphology of nanoparticles, and the specific surface area, respectively, were carried out. For the developed magnetocaloric nanofluid, shear rate variation illustrates the non-Newtonian behavior of Bingham plastic. The results show that increasing the mass concentration of nanoparticles from 0.05 % to 0.8 % results in about 80 % increase in viscosity at 10 °C. Additionally, thermal conductivity has increased to a maximum of 9.4 % at 50 °C and is improved by increasing temperature.