Browsing by Author "Benkhedda, Mohammed"

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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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    Heat Transfer Investigation of Laminar Flow Mixed Convection of Nanofluids in a Uniformly Heated Horizontal Annulus: A Combination of Theoretical-Based and Experimental-Based Models of Thermal Conductivity and Viscosity
    (Scientific.net, 2023) Benkhedda, Mohammed
    This present study is intended for a CFD analysis of hydrodynamic and thermal characteristics of water-based fluid containing TiO2 or CuO nanoparticles flowing in laminar regime in a 3D uniformly heated horizontal annulus utilizing several. Four distinct models have been developed using various combinations (A, B, C and D) of the available theorical-based and experimental-based thermal conductivity and viscosity correlations. A CFD-Fortran code based on the finite volume technique was elaborated for the numerical solution of the mathematical model of the problem. The implications of Grashof number, volume fraction, and type of nanoparticle on isovelocity, isotherms, mean and wall temperatures, Nusselt number, heat transfer coefficient, pressure drop, and thermal performance evaluation criteria are explored using these different models. The results demonstrate that the Nusselt number and heat transfer coefficient of all developed models improve with the addition of nanoparticles. For 2% of nanoparticles’ concentration, the largest enhancement was reached for model D by about 23.5% with respect to the based liquid, while the smallest enhancement was obtained for model B by about 1.16%. The highest Performance Evaluation Criteria (PEC) are attained by employing model D by about 1.263, followed by model C by about 1.074
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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.