Unsteady MHD jeffrey nanofluid flow over porous stretching sheet with cattaneo-christov double diffusion and stefan...

The present study examines the unsteady boundary-layer flow, together with heat and mass transport of Jeffrey nanofluid over a porous stretched sheet influenced by magnetic field effects, Stefan blowing/suction, and porous medium resistance. The study aims to improve the understanding of heat and mass transport in non-Newtonian nanofluids under complex flow conditions. The Buongiorno two-phase model captures nanoparticle dynamics via Brownian motion and thermophoresis, by incorporating Cattaneo-Christov double-diffusion fluxes to describe realistic thermal and concentration relaxation beyond classical Fourier's law and Fick's laws. The governing equations are transformed into ordinary differential equations using similarity transformations and solved numerically using MATLAB bvp4c solver. Key findings show that unsteadiness, magnetic strength, and porosity reduce velocity profiles through temporal fluctuations, Lorentz drag, and Darcy resistance, while thickening thermal boundary layers through dissipation. Cattaneo-Christov relaxation parameters reduce temperature and concentration profiles by delaying heat and mass flux propagation, boosting Nusselt and Sherwood number especially under suction. The findings provide engineering guidance for optimizing non-Newtonian nanofluid systems in heat exchangers, solar collectors, electronic cooling, and porous media applications where MHD and non-Fourier phenomena prevail.