Computational framework of magnetized MgO-Ni/water based stagnation nanoflow past an elastic stretching surface : application in solar energy coatings

Bhatti, MM, Beg, OA ORCID: https://orcid.org/0000-0001-5925-6711 and Abdelsalam, SI 2022, 'Computational framework of magnetized MgO-Ni/water based stagnation nanoflow past an elastic stretching surface : application in solar energy coatings' , Nanomaterials, 12 (7) , p. 1049.

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Abstract

In this article, motivated by novel nanofluid solar energy coating systems, a mathematical model of hybrid Magnesium oxide (MgO)-nickel (Ni) nanofluid magnetohydrodynamic (MHD) stagnation point flow impinging on a porous elastic stretching surface in a porous medium is developed. The hybrid nanofluid is electrically conducting and magnetic Reynolds number is sufficiently large to invoke induced magnetic field. A Darcy model is adopted for the isotropic, homogenous porous medium. The boundary conditions account for the impacts of velocity slip and thermal slip. Heat generation (source)/absorption (sink) and also viscous dissipation effects are included. The mathematical formulation has been performed with the help of similarity variables and the resulting coupled nonlinear dimensionless ordinary differential equations have been solved numerically with the help of shooting method. To test the validity of the current results and the convergence of the solutions, a numerical comparison with previously published results is included. Numerical results are plotted for the effect of emerging parameters on velocity, temperature, magnetic induction, skin friction and Nusselt number. With increment in nanoparticle volume fraction of both MgO and Ni nanoparticles, the temperature and thermal boundary layer thickness of the nanofluid are elevated. An increase in porous medium parameter (Darcy number), velocity slip and thermal Grashof number all enhance the induced magnetic field. Initially increment in nanoparticle volume fraction for both MgO and Ni suppress the magnetic induction near the wall although subsequently further from the wall this effect is reversed. Temperature is enhanced with heat generation whereas it is depleted with heat absorption and thermal slip effects. Overall excellent thermal enhancement is achieved by the hybrid nanofluid.

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