THERMAL RADIATION AND SUCTION/INJECTION EFFECTS ON MIXED CONVECTION HEAT TRANSFER IN A POROUS COAXIAL CYLINDRICAL CHANNEL
DOI:
https://doi.org/10.33003/fjs-2026-1004-4596Keywords:
Suction/injection, Navier Slip, Thermal Radiation, Darcy Porous Medium, Coaxial cylinderAbstract
This study investigates the mixed convection heat transfer flow within a coaxial cylinder filled with a homogeneous porous medium. The mathematical model integrates the influences of heat radiation, Navier slip, and wall suction/injection. The Darcy–Brinkman model and the Rosseland approximation for radiative heat flux are employed to adjust the governing equations for momentum and energy formulated in cylindrical coordinates. Boundary conditions that account for slip velocity and mass suction/injection transfer are applied at the cylinder walls. Analytical solutions are obtained by solving the resulting nonlinear coupled equations. Parametric calculations indicate that injection promotes fluid acceleration within the annulus, while suction mitigates flow reversal and enhances thermal stability. Navier slips reduce skin friction at both the lower and upper cylindrical walls. Nevertheless, MHD reduces wall shear stress, especially near the inner cylinder. Thermal radiation increases the thermal boundary layer and elevates the temperature and velocity domains. Furthermore, it was demonstrated that the Darcy porous media significantly enhanced the velocity domain, leading to increased permeability with a rising value of Da. The findings provide significant insights for engineering designs involving porous annuli, thermal insulation devices, catalytic reactors, membrane filtration, and energy systems.
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Copyright (c) 2026 Abdulsalam Shuaibu, Yakubu Bello, Auwal Musa Kallamu, Godwin Ojemeri, Rashida Abdulrauf
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