Effect of irregular heat source/sink on the radiative thin film flow of MHD hybrid ferrofluid

Ferrofluids are the colloidal suspensions of magnetic nanoparticles and base fluids. It has several medical applications like drug targeting, cell separation, magnetic resonance imaging, etc. The dispersion of more than one magnetic nanoparticle into the convectional fluid is called hybrid nanofluid. It has various technological applications like damping, dynamic sealing, heat dissipation, etc. Due to the immense applications of the ferrofluids, in this analysis, we examined the liquid film flow and heat transfer of hybrid ferrofluid in the attendance of radiation and irregular heat source/sink. We considered the magnetite (Fe 3 O 4 ) and cobalt ferrite (CoFe 2 O 4 ) nanoparticles and suspended them into water–ethylene glycol (EG) mixture (50–50%). A mathematical model is developed for the present investigation and solved numerically after applying the suitable similarity transformations. The impact of various governing non-dimensional parameters on the momentum, energy fields, and local Nusselt number of ferro- and hybrid ferrofluids is studied with the aid of graphical illustrations. It is perceived that the rate of heat transfer is higher in hybrid ferrofluid than that of ferrofluid.