Effect of External Field on Hybrid Fluids in Permeable Arteries for Drug Delivery

This study looks into the magneto hydrodynamics (MHD) flow of a micropolar hybrid nanofluid in a stretching permeable arterial channel. It considers external magnetic and electric fields, along with velocity slip and thermal effects. Transforming the nonlinear momentum, micro rotation, energy, and concentration equations into a system of ordinary differential equations using similarity transformations, and solve this system with a collocation shooting method. Validation against Newtonian and non-micropolar limits shows deviations below 1.8%, confirming the model’s reliability. The results indicate that increasing the Hartmann number ( M = 0 − 4) reduces axial velocity by up to 27% and raises nanoparticle concentration by 15–20%. A higher thermophoresis parameter (Nt = 0.1 − 0.5) increases the wall Nusselt number by 12%. In contrast, Brownian motion (Nb = 0.2 − 0.8) lowers the Sherwood number by 9%. The micropolar coupling parameter greatly affects microrotation and reduces wall shear stress by 18% compared to Newtonian flow. These findings show that external fields can effectively control nanoparticle transport and suggest promising applications for better intravascular drug delivery.