• Developed a unified model for Jeffrey hybrid nanofluid MHD flow • Incorporated thermal solutal stratification and Soret Dufour effects. • Solved the nonlinear system using the spectral relaxation method (SRM) • Magnetic field suppresses velocity and thickens thermal boundary layer • Radiation and viscous dissipation increase fluid temperature • Hybrid CNT nanofluid enhances thermal transport performance • Coupled stratification and diffusion modify heat–mass transfer behaviour • SRM provides stable and rapidly convergent numerical solutions • Chemical reaction and Schmidt number reduce concentration field • Results aid the design of advanced thermal and energy systems The work examines the influence of multiple interacting physical mechanisms on steady, two-dimensional boundary-layer flow of a non-Newtonian Jeffrey hybrid nanofluid over a stretching sheet placed within a porous medium. The analysis incorporates thermal–solutal stratification, magnetohydrodynamic effects, thermal radiation, viscous dissipation, chemical reaction, and cross-diffusion phenomena represented by the Soret and Dufour effects. The working fluid consists of a hybrid suspension of single-walled and multi-walled carbon nanotubes dispersed in a base liquid to improve thermal conductivity and transport efficiency. Through appropriate similarity transformations, the governing nonlinear partial differential equations are converted into a system of coupled nonlinear ordinary differential equations. These equations are solved numerically using the Spectral Relaxation Method in conjunction with a Chebyshev pseudo-spectral scheme, providing stable and rapidly convergent solutions. Parametric analysis is performed to evaluate the behaviour of velocity, temperature, and concentration fields. The results indicate that stronger magnetic interaction reduces fluid motion due to resistive Lorentz forces while increasing thermal boundary-layer thickness. Larger Prandtl numbers diminish temperature distribution and enhance heat transfer performance. Thermal radiation and viscous dissipation contribute to a rise in fluid temperature. The Dufour effect augments thermal energy via concentration gradients, whereas the Soret effect intensifies species diffusion driven by temperature differences. Moreover, higher Schmidt number and chemical reaction rate reduce concentration levels, strengthening surface mass transfer.
K Ashok Reddy (Fri,) studied this question.