This study focuses on a steady two-dimensional laminar boundary-layer flow of a chemically reactive Casson nanofluid over a linearly stretched sheet in the presence of Brownian motion, thermophoresis, uniform heat generation, porous medium effects, and chemical reaction. The governing nonlinear partial differential equations for momentum, energy, and concentration transport are converted into a set of coupled nonlinear ordinary differential equations using appropriate similarity transformations. The resulting equations are numerically solved with the Keller Box method. The effects of key physical parameters, such as the Casson fluid parameter, Brownian motion parameter, thermophoresis parameter, Prandtl number, Lewis number, porous medium parameter, heat generation parameter, wall injection parameter, and chemical reaction parameter, on the velocity, temperature, and concentration fields are thoroughly investigated. The findings show that raising the Brownian motion and thermophoresis parameters boosts the thermal field and dramatically thickens the thermal boundary layer. In contrast, greater Prandtl and Lewis numbers diminish the thickness of the thermal boundary layer. As thermophoresis, Lewis number, and chemical reaction parameters increase, the concentration distribution reduces due to increased nanoparticle diffusion and species consumption. Furthermore, increasing porous medium resistance reduces fluid velocity and promotes thermal energy retention inside the boundary layer. Quantitative analysis shows that increasing the thermophoresis parameter from Nt = 0.1 to Nt = 0.5 increases the local Nusselt number from 2.1294 to 3.0351, a 42.53% increase, while decreasing the local Sherwood number from 0.9523 to 0.3211, a 66.28% reduction. The computed findings are in great agreement with previously published benchmark solutions, proving the correctness, stability, and dependability of the Keller Box numerical technique. The current findings provide light on the mechanisms that accelerate heat and mass transfer in chemically reactive Casson nanofluid flows across porous media, as well as the possible engineering applications.
Prashanth et al. (Wed,) studied this question.