A case study on heat transport of electrically conducting water based-CoFe₂O₄ ferrofluid flow over the disc with various nanoparticle shapes and highly oscillating magnetic field

The objective of the current paper is to explore the unsteady electrically conducting ferro-nanofluid flow over the stretchable rotating porous disc with the presence of Hall effect and viscous dissipation. Various shapes of Cobalt-Ferrite (CoFe₂O₄) nanoparticles(Blade, Brick and Platelet) are considered and dispersed in the base fluid as water (H₂O) to make the ferro-nanofluid. Among different magnetic nanoparticles, Cobalt-Ferrite (CoFe₂O₄) nanoparticles are very interesting due to their high chemical stability, good reactivity, high surface area, excellent semiconductivity, easy synthesis, high catalytic performance, and superior magnetic properties. The Darcy–Forchheimer fluid model and highly oscillating magnetic field is employed to develop the ferrofluid flow system and Newtonian heating has been incorporated in the boundary condition. By employing the suitable similarity transformation the set of partial governing transport equations are modified into the set of highly nonlinear ordinary differential equations and solved via Runge–Kutta–Fehlberg method along with shooting technique. The present results are compared with earlier published results, and it has an excellent agreement. Key heat transfer parameters, such as Nusselt number, temperature profiles, fluid velocity distributions are analysed and compared across different nanoparticle shapes and magnetic field strengths. The results demonstrate that the nanoparticle shape significantly influences the heat transfer rate and temperature distribution within the ferrofluid. Moreover, the skin friction force is significantly affected 2.18% by increasing the high field frequency (1≤ω₀τ_B≤3) and skin friction force increased 0.6% by adjusting the electrical parameter (0.2≤E₁≤0.4). The heat transfer rate is enhanced 0.5% due to rising the high field frequency. In addition, this work is developed to multiply the rate of energy transference and increasing the execution as well as effectiveness of energy delivering in industrial field. This model considers the Hall effect, since it helps in achieving energy circulation in numerous devices like refrigerators and in other heating applications. Especially using the magnetized nanofluid helps in improved energy transmission in biomedical imaging.