This study investigates the mechanisms of entropy generation associated with energy and momentum transport in a magnetic nanofluid flowing over a horizontally stretching cylinder embedded in a porous medium. The formulated mathematical problem is reduced into system of non-dimensional equations by the implementation of suitable similarity transformations. The current non-dimensional model is subsequently computed numerically through the MATLAB-based boundary value problem solver, bvp4c. The analysis presents detailed graphical results to illustrate the effects of various physical parameters on the profiles of velocity, temperature, concentration, entropy generation, and Bejan number. Results demonstrate that the stretching cylinder exhibits a thicker boundary layer and higher entropy generation compared to a flat surface. Key thermodynamic quantities include skin-friction factor, Nusselt and Sherwood numbers are communicated with the help of tables to quantify surface shear, heat and mass transfer. Findings of this study are especially valuable for advancing high-performance cooling platforms, including solar collectors, electronic thermal management, and industrial heat-exchange units. The ability to precisely control heat and mass transfer in such systems is not just useful but fundamentally decisive for achieving reliable and energy-efficient operation. This work offers comprehensive insights into the thermodynamic irreversibility and transport behavior in magneto-porous nanofluid systems.
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