Browsing by Author "Boufendi, Toufik"

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    3D numerical analysis of MHD‐assisted forced convection and entropy generation in a porous heated tube using ternary nano‐fluids
    (Springer, 2025) Zeroual, Hamza; Benkhedda, Mohammed; Boufendi, Toufik; Tayebi, Tahar
    This study presents a numerical investigation of magnetohydrodynamic forced convection and entropy generation in a uniformly heated horizontal tube flled with porous media, using binary (Al2O3–TiO2/Water-EG) and ternary (Al2O3–TiO2–CNT/ Water-EG) hybrid nano-fuids. The fow and thermal felds are modeled using the fnite volume method with single-phase and thermal-equilibrium assumptions. The analysis is conducted for a Reynolds number of 750, nanoparticle volume concentration of 6%, Darcy numbers ranging from 10⁻ 4 to 10⁻ , and Hartmann numbers between 10 and 40, under two magnetic feld orientations (0° and 90°). The results demonstrate that reducing the Darcy number signifcantly enhances heat transfer, with the binary hybrid nano-fuid achieving up to a 105.36% improvement. Additionally, applying the magnetic feld parallel to the fow (0°) leads to further enhancement, particularly for the ternary hybrid nano-fuid. In contrast, when the magnetic feld is perpendicular (90°), its infuence on thermal performance is negligible. This study highlights the synergistic efects of nanoparticle composition, magnetic feld orientation, and porous media structure, ofering new insights into optimizing nano-fuid-based thermal systems for enhanced energy efciency.
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    Three-dimensional mixed convection and entropy generation of binary and ternary hybrid nanofluids flow inside a porous media-filled horizontal annular duct under magnetic field
    (Springer Nature, 2024) Necib, Nihal; Benkhedda, Mohammed; Tayebi, Tahar; Boufendi, Toufik
    In the present investigation, computational study of magneto-laminar flow mixed convection and entropy generation using two binary (TiO2-CNT/kerosene), (TiO2-Gr/kerosene) and ternary hybrid (TiO2-CNT-Gr/kerosene) nanofluids inside three‐dimensional horizontal annular duct saturated with porous media are numerically investigated. The exterior cylinder’s surface is uniformly heated through a uniform heat flux, whereas the interior cylinder’s surface is adiabatic. The numerical solutions are obtained using the finite volume method (FVM). The single-phase and thermal equilibrium models are adopted. The control parameters are: Darcy number (10−4 ≤ Da ≤ 10−1), Hartmann number (0 ≤ Ha ≤ 50), magnetic field inclination (ψ = 0°, ψ = 90°), Grashof number (Gr = 106), and nanoparticle concentrations 5%. The study of hydrodynamic and thermal behavior reveals that significant improvements in heat transfer are obtained when a magnetic field is applied horizontally and in the same direction as the flow. At the same time, it involves retardation on the hybrid nanofluids flow. Moreover, when the Darcy number increases, the heat transfer rate reduces by 24%, 23%, and 21% for TiO2-CNT-graphene/kerosene, TiO2-CNT/kerosene, and TiO2-Graphene/kerosene, respectively. No significant influence was observed on heat transfer when the applied magnetic field was perpendicular to the flow direction and in the same direction as the buoyancy force.