Thermal analysis of ferromagnetic nanofluid flow in a channel over a dimpled cavity.

• This model investigates mixed convection of ferrofluids in a dimpled channel. • Finite element analysis has been carried out to study the heat and flow behaviour. • Reynolds and Rayleigh numbers enhance the average heat transfer rate. • Intensifying the magnetic field results in stronger isotherms in the dimpled cavity. • The rectangular obstacle helps in increasing the average Nusselt number. The water-based nanofluid analysis of a ferromagnetic fluid flow in a channel has been conducted over a dimpled cavity. The horizontal flat walls are assumed to be adiabatic, whereas the dimpled part and the inner rectangular-finned-shaped obstacle are heated. The system of Partial Differential Equations (PDEs) along with boundary conditions have been solved via Galerkin Weighted Residual Finite Element Method. To predict the streamlines isotherms, local and average Nusselt numbers, all the simulations are performed for various Reynold and Hartmann numbers. High Reynolds numbers, results in significant improvement in heat transfer at the dimpled surface. It is believed that such investigation might be helpful to make a base for finding the experimental results for mixed convection of ferromagnetic nanofluid problem over a dimpled cavity. [ABSTRACT FROM AUTHOR]