Irreversibility analysis of hybrid nanofluid flow over a rotating disk: Effect of thermal radiation and magnetic field

Abstract

The present study numerically explores the thermally radiative incompressible flow of hybrid nanofluid due to the stretchable rotational disk with the consideration of externally applied magnetic field and examines the underlying transport of heat both qualitatively as well as quantitatively. Pertaining to this study, the traditional von Karman approach is applied to convert partial derivative form of governing nonlinear transport equations into ordinary derivative form and is then evaluated by using an efficient boundary value problem (BVP4c) solver. The simulated results of flow-field variables such as velocity, temperature, friction-factor coefficients for various physical factors have been discussed both apparently in graphical form as well as numerically in the tabular form. In addition, we aptly discussed the influence of entropy heat generation and Bejan number obtained for different physical parametric values on the underlying thermohydrodynamics. The results indicate that the radial and tangential velocities across the rotating disk decrease for greater values the magnetic parameter (M) and slip factor (γ). As shown in this study, the effect of augmented fractional volume (ϕ2) leads to a decrease of the fluid velocity owing to the accumulation of the nanoparticles in the working fluid. An increasing the value of magnetic and radiation parameters results in thickening the thermal boundary layer, which in turn induce an enhancement in the fluid temperature. Finally, it is seen that for an intense effect of the thermal radiation and viscous dissipation, the thermodynamic irreversibility in the present system becomes higher. We believe that the developed modelling frame-work has the potential to effectively analyze the underlying fluid flow and heat transfer in turbomachinery, high-end heat transfer process applications.