article · Journal of Physical Science
This study develops numerical and theoretical models for coupled heat and mass transfer within a porous, isotropic and saturated cylindrical cavity. The medium contains a Casson nanofluid formulated with aluminium nanoparticles, accounting for thermal radiation, chemical reactions, magnetic fields, and Soret and Dufour cross-diffusion phenomena. Governing equations derived from the extended Brinkman-Forchheimer-Darcy law are solved using the finite volume method across multiple operational parameters. The analysis establishes that the heat transfer rate increases with higher chemical reaction parameters, geometric aspect ratios, Casson fluid parameters, thermal conductivity ratios and thrust ratios, but declines with stronger magnetic fields and higher Dufour numbers. Furthermore, mass transfer rates improve with elevated thermal conductivity, thrust ratios and aspect ratios, whereas magnetic fields, Soret effects and chemical reactions diminish mass transport.
Understanding how magnetic fields, chemical reactions and radiation influence heat and fluid movement in nanofluids is essential for refining complex transport models. By mapping how cross-diffusion and fluid properties alter thermal and concentration gradients within porous media, this theoretical work clarifies the fundamental physical mechanisms governing multi-component fluid dynamics in enclosed spaces.
The abstract does not indicate an application pathway or potential commercial use for this theoretical and numerical modelling work.
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The objective of this study is to numerically and theoretically model the coupled heat and mass transfer in a porous, isotropic and saturated medium filled with a Casson nanofluid containing aluminium nanoparticles, taking into account the effects of radiation, chemical reactions, a magnetic field and the Soret and Dufour effects. The analysis is conducted for various parameters relevant to the model, including the chemical reaction parameter (ranging from 0–20), the radiation parameter (0–2), the Casson fluid parameter (0.1–1), the Soret and Dufour numbers (0–1), the conductivity ratio (1–3), the Hartmann number (0–100) and the thrust ratio (1–2). The horizontal boundaries of the cavity are maintained at constant temperature and concentration, while the vertical walls are assumed to be rigid, impermeable and adiabatic. The flow of the Casson nanofluid in the porous medium is governed by the extended Brinkman–Forchheimer–Darcy law. The system of equations is solved using the finite volume method. The findings reveal that the heat transfer rate increases with the chemical reaction parameter, geometric aspect ratio, Casson fluid parameter, thermal conductivity and thrust ratio. Conversely, the heat transfer rate decreases with higher Hartmann and Dufour numbers. Regarding mass transfer, it increases with higher thermal conductivity, thrust ratio and geometric aspect ratio, but decreases with higher Hartmann number, Soret effect and chemical reaction parameter.
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DOI: 10.21315/jps2026.37.2.1
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