NUMERICAL STUDY OF ELECTROMAGNETIC AND THERMOPHYSICAL EFFECTS ON MICROPOLAR NANOFLUID FLOW OVER A STRETCHING SHEET

This study presents a numerical investigation of mixed convection heat and mass transfer in an electrically conducting micropolar nanofluid flow over a stretching surface embedded in a porous medium. The model integrates several significant physical phenomena, including Brownian motion, thermophoretic diffusion, electromagnetic effects from transverse magnetic and electric fields, radiative heat transfer based on the Rosseland approximation, and internal heat generation or absorption. The governing partial differential equations, formulated under boundary layer assumptions, are transformed into a system of ordinary differential equations through similarity transformations. These equations are then solved using the Keller-box method, an implicit finite difference technique known for its stability and accuracy. The impact of various dimensionless parameters, such as velocity ratio, magnetic field intensity, Prandtl number, Schmidt number, and Eckert number, is analysed in detail. Microrotation and flow characteristics are significantly influenced by parameters like wall mass transfer and buoyancy, according to the study, which demonstrates that an increase in the thickness of the magnetic field thickens thermal and velocity boundary layers. The robustness of the proposed model is demonstrated by the strong agreement between the results obtained and the existing literature.