Browsing by Author "Benkhedda, Mohamed"

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    Convective Heat Transfer Performance of Nanofluid in a Horizontal Annular Duct Considering Nanoparticles Shapes Effect
    (Institute of Electrical and Electronics Engineers Inc., 2019) Benkhedda, Mohamed; Boufendi, T.
    In The present study investigates laminar forced convection heat transfer in a concentric annular space saturated with nanofluids. The inner cylinder is adiabatic while the outer cylinder is uniformly heated. The governing equations with the appropriate boundary conditions are discretized by the finite volume method with second order precision and solved by using the SIMPLER and Thomas algorithms. The effects of some parameters such as the nanoparticles types Ag and CuO, the shapes like blades, platelets, cylinder and bricks, and nanofluid volume fraction on heat transfer are completely studied and discussed. The results show that the Nusselt number, the bulk, and wall temperatures increase with the increase of nanoparticle volume fraction. A linear increase is observed for the average Nusselt number by increasing the volume fraction. Silver nanoparticles Ag give better heat transfer compared with the CuO nanoparticles for the blade shape followed by the elongated shape like platelet and cylinder and in last place brick shape
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    Toward the thermohydrodynamic behavior of a nanofluid containing C-MWCNTs flowing through a 3D annulus channel under constant imposed heat flux
    (Wiley, 2021) Benkhedda, Mohamed; Tayebi, Tahar; Chamkha, Ali J.
    The heat transport and friction factor in a three-dimensional horizontal concentric annular duct filled with nanofluids comprising clove-treated multiwalled carbon nanotubes are investigated numerically in this paper. The cylinder's outer surface is thermally insulated, while uniform heat flux is imposed on the cylinder's inner surface. The problem is formulated in dimensionless cylindrical coordinates. The numerical solutions were obtained based on the finite volume technique with second-order precision, and cover a range of the Reynolds number 1000 ≤ Re ≤ 2000 and nanoparticle weight fractions 0.075, 0.125, and 0.175 wt%. To describe the results for both heat exchange and fluid flow performance, the temperature profile, Nusselt number, heat transfer coefficient, and friction factor are represented. The findings state that heat transport increases as Reynolds is increased and nanoparticles are introduced. The friction factor was also observed to improve as the concentration of nanoparticles increased. In addition, two new Nusselt number and friction factor correlations were established