Chemical reaction, heat absorption and Newtonian heating on MHD free convective Casson hybrid nanofluids past an infinite oscillating vertical porous plate

Abstract

The numerical investigation of Newtonian heating effect on unsteady MHD free convective flow of radiating and chemically reacting Casson hybrid nanofluid past an infinite oscillating vertical plate embedded in a porous medium is conducted by considering the effects of heat sink and viscous dissipation. The fluid motion is persuaded due to the periodic oscillations of the plate along its length. First order consistent chemical reaction and heat absorption are also regarded. The Silver and Titania nano-particles are disseminated in base fluid water and ethylene glycol combination to be formed hybrid nanofluid. This phenomenon is represented as non-linear partial differential equations with initial and boundary conditions. By introducing suitable non-dimensional variable and parameters, the governing equation with initial and boundary conditions are converted into dimensionless form, which are then solved numerically using a finite difference method. It is considered as the values of Hartmann parameter 0 < M ≤ 2; the values of the penetrability parameter are 0 < K ≤ 3; Casson fluid parameter 0 < α < 4; thermal Grashof number 0 < Gr ≤ 20, mass Grashof number 0 < Gm ≤ 12; heat source parameter 0 < Q ≤ 8; the values of ϕ1 and ϕ2 volume fractions of Ag and TiO2 are 0.01, 0.05, 0.1 and 0.15; the Schmidt number as Sc = 0.22, 0.3, 0.6, 0.78 this analogous to hydrogen, helium, water vapours, as well as ammonia respectively; chemical reaction parameter 0 < Kc ≤ 4. The effects of several pertinent parameters on the velocity, temperature and concentration are displayed graphically whilst the effects of these parameters on the skin friction, Nusselt and Sherwood numbers are exhibited in tabular format and then discussed in detail. The velocity distribution is enhanced with increasing in permeability parameter, Newtonian heating parameter and thermal Grashof number whereas it is reduced with increasing Hartmann number, heat absorption parameter and Casson fluid parameter. Heat transport participates the significant role during the managing and dispensation of Casson fluids. This is of immense significance in numerous engineering applications, they are, transpiration cooling, termite welding, drag reduction as well as heat recovery of oils. In addition, this plays the enlargement of bio-convection prototypes produced by the populations of gravitactic microorganism in the porous media.