A computational framework for micropolar fluid considering chemical reaction in porous media with stagnation point flow over a stretchable sheet in the presence of viscous dissipation

The study of fluid flow over stretchable surfaces is crucial in numerous engineering and industrial applications. Particularly, the behavior of micropolar fluids which account for microstructure effects not captured by Newtonian models, presents a more accurate representation in areas like polymer processing and biological flows. The presence of porous media, stagnation point, thermal radiation and viscous dissipation further complicates the flow dynamics heat and mass transfer characteristics, making their coupled implications a significant area for research. Understanding these combined effects is vital for optimizing system performance in scenarios where chemical reactions are involved. The key objective of this study is to explore the implications of a chemically reactive micropolar fluid on a stretchable sheet in the presence of porous media, a stagnation point, thermal radiation and viscous dissipation. The analysis intends to scrutinize how these aspects adjust microrotation, temperature, velocity and concentration fields within boundary-layer. The system of partial differential equations (PDEs) governing the fluid flow, heat and mass transfer is first converted into a system of ordinary differential equations (ODEs) using appropriate similarity transformations. The bvp4c procedure is then deployed to derive the numerical solutions. This method is used to accurately estimate the numerical values of the drag force, heat transmission rate and mass transmission rate for various emerging parameters. The computations are verified with previous research to confirm the outcomes. The velocity field increases for higher micropolar parameter but declines with escalating suction parameter and porosity parameter. Temperature field rises with higher Eckert number while it declines for enlarged Prandtl number estimations. An increment in Schmidt number and chemical reaction factor yield lower concentration distribution. The numerical computations of drag force, mass transmission rate and heat transmission rate are estimated with greater accuracy and validated against existing literature. The efficacy of the bvp4c method in providing trustworthy solutions is exhibited.