Applied Journal of Physical Science

The present study investigates the electromagnetohydrodynamic (EMHD) boundary-layer flow, heat transfer, and mass transport of an electrically conducting viscous fluid over an exponentially stretching cylindrical surface with applications in advanced material processing systems. The mathematical model incorporates the combined effects of thermal radiation, chemical reaction, electromagnetic forces, and buoyancy-induced transport mechanisms. By employing suitable similarity transformations, the governing nonlinear partial differential equations are transformed into a coupled system of dimensionless ordinary differential equations. The resulting system is solved numerically using the Chebyshev Spectral Collocation Method (CSCM), which is renowned for its high accuracy, rapid convergence, and computational efficiency in solving nonlinear boundary-value problems. The influence of key physical parameters, including the Hartmann number, radiation parameter, Schmidt number, thermal Grashof number, solutal Grashof number, Reynolds number, electrical conductivity parameter, and chemical reaction parameter, on the velocity, temperature, and concentration distributions is examined in detail. Numerical results reveal that increasing the Hartmann number suppresses fluid velocity due to the enhanced Lorentz force generated by the applied magnetic field. Conversely, thermal radiation significantly elevates fluid temperature and increases the thickness of the thermal boundary layer. Furthermore, higher Schmidt number and chemical reaction parameters reduce species concentration within the boundary layer owing to diminished mass diffusivity and accelerated species consumption, respectively. The findings demonstrate that the Chebyshev Spectral Collocation Method provides stable and highly accurate solutions for complex EMHD transport problems involving cylindrical geometries. The developed model offers valuable theoretical insights for optimising electromagnetic control strategies in polymer extrusion, thin-film coating, metallurgical manufacturing, thermal processing, and other advanced material fabrication technologies.