Thermofluidic simulation of magneto-radiative viscoelastic nanomaterial flow in a chemically activated porous duct with double-diffusive convection

This research focuses on a numerical exploration of how activation energy, double-diffusive convection, and radiative thermal effects influence wave-induced motion of a viscoelastic nanofluid flowing through a porous, flexible micro-channel. The formulated model represents a nature-inspired approach for the controlled transport of hazardous chemical species. To accomplish this, a viscoelastic nanofluid framework based on Jeffrey fluid theory is constructed, incorporating the influences of activation energy, thermal radiation, magnetic fields, internal heat generation, Brownian diffusion, thermophoretic transport, and cross-diffusion mechanisms. Utilizing lubrication theory, the governing equations are simplified, converted into non-dimensional form, and numerically solved using a finite-difference-based computational scheme in MATLAB. Comprehensive parametric investigations are carried out to examine the flow and heat transfer characteristics. The findings indicate that an increase in the nanofluid Grashof number as well as magnetic field strength leads to a reduction in axial velocity, whereas thermophoretic and Dufour contributions significantly intensify thermal gradients. Higher activation energy decreases solute concentration, while thermophoresis serves as a key mechanism driving particle migration. Pronounced bolus formations appear under varying porous-resistance conditions, demonstrating notable enhancement in flow trapping. Moreover, elevating the porosity parameter from 0.1 to 0.3 produces a 47.77 % rise in the skin-friction coefficient near the channel wall. Overall, this investigation provides valuable guidance for designing and optimizing microfluidic devices utilized for hazardous material management, targeted drug transport, and thermal control in biomedical and environmental engineering systems, particularly those involving thermal radiation, viscoelastic behavior, and porous media resistance.