Thermomagnetic reactive ethylene glycol-metallic nanofluid transport from a convectively heated porous surface with ohmic dissipation, heat source, thermophoresis and Brownian motion effects

The objective of this study is to develop a mathematical model for chemically reacting magnetic nanofluid flowwith thermophoretic diffusion, Brownian motion and Ohmic magnetic heating in a Darcian permeable regime.The current flow model also considers a number of different nanofluid types i.e. Cu, Ag and Au nanoparticleswith base fluid ethylene glycol. Effectively a nanoscale formulation combining the Buongiorno two-componentmodel with the Tiwari-Das model is deployed so that a nanoparticle species diffusion equation is also includedas well as material properties for specific nanoparticles and base fluids. By means of similarity transformations,non-linear dimensionless ordinary differential equations are derived (from the original partial differentialequations) and solved numerically by means of Runge-Kutta-Fehlberg-fourth fifth order method. The effect ofemerging parameters on velocity, temperature, concentration, skin friction, Nusselt number and Sherwoodnumber profiles is visualized graphically. Validation with earlier studies is included. The computations showthat temperatures are suppressed with greater thermal Grashof and Biot numbers. Nanoparticle-concentrationsare strongly diminished with increasing reactive species and Lewis number, whereas Sherwood number iselevated with stronger chemical reaction effect. The study is relevant to magnetic nanomaterials processing