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Mohamed Benkhedda

Bio: Mohamed Benkhedda is an academic researcher from University of Boumerdes. The author has contributed to research in topics: Nusselt number & Nanofluid. The author has an hindex of 2, co-authored 3 publications receiving 27 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a laminar mixed convection in horizontal annulus filled with a TiO2/water nanofluid and Ag-TiO 2/water hybrid nanofluid has been numerically studied, and the results reveal that the numerical data are in a good agreement with the correlation data.
Abstract: In the present paper, laminar mixed convection in horizontal annulus filled with a TiO2/water nanofluid and Ag-TiO2/water hybrid nanofluid has been numerically studied. The outer cylinder is uniformly heated while the inner cylinder is adiabatic. 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 numerical simulations are performed for various nanoparticles volume fractions, between 0 and 8% and Grashof numbers between 105 and 106. The results shows that for all studied Grashof numbers, the local and average Nusselt numbers, and the bulk temperature increase with the increasing of the volume fraction and the Grashof number. The heat transfer is very enhancement when using a Ag-TiO2/water hybrid nanofluid compared to the similar TiO2/water nanofluid. Moreover, the exploitation of the numerical results that we obtained enabled us to develop two new correlations, which allow the estimation of the average Nusselt number. The results reveal that the numerical data are in a good agreement with the correlation data. The maximum error for nanofluid and hybrid nanofluid was around 2.5% and 4.7% respectively. Hence, among the multitude of the obtained results in this work, it remains that the new correlations developed, especially for the hybrid nanofluid Ag-TiO2 / water, constitute for their originality, the most significant result of this research.

33 citations

Proceedings ArticleDOI
01 Nov 2016
TL;DR: In this article, a three dimensional laminar mixed convection of nanofluid flow in horizontal concentric annulus is investigated numerically based on single-phase fluid approach, where constant heat flux is applied on the outer cylinder, while the inner cylinder is adiabatic.
Abstract: In this work, a three dimensional laminar mixed convection of nanofluid flow in horizontal concentric annulus is investigated numerically based on single-phase fluid approach. The constant heat flux is applied on the outer cylinder, while the inner cylinder is adiabatic. The annular space is filled with Silver-Water nanofluid. The governing equations are discretized using the finite-volume method and the SIMPLER algorithm was used for resolve the pressure-velocity coupling. The results are presented for the dynamical and thermal fields for a fixed Reynolds number to 800, two Grashof numbers to 105 and 5×105, and the particle volume fraction from zero to 6%. According to the results, the Nusselt number and the bulk and walls temperatures increase with the increasing of the volume fraction and the Grashof number. Also a very good agreement with the results of similar works available in the literature is observed.

5 citations

Proceedings ArticleDOI
01 Nov 2019
TL;DR: In this paper, 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.
Abstract: 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.

2 citations


Cited by
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01 Jan 2016
TL;DR: The numerical heat transfer and fluid flow is universally compatible with any devices to read and is available in the authors' digital library an online access to it is set as public so you can get it instantly.
Abstract: Thank you for reading numerical heat transfer and fluid flow. Maybe you have knowledge that, people have search numerous times for their favorite books like this numerical heat transfer and fluid flow, but end up in infectious downloads. Rather than reading a good book with a cup of coffee in the afternoon, instead they cope with some malicious virus inside their computer. numerical heat transfer and fluid flow is available in our digital library an online access to it is set as public so you can get it instantly. Our books collection spans in multiple countries, allowing you to get the most less latency time to download any of our books like this one. Merely said, the numerical heat transfer and fluid flow is universally compatible with any devices to read.

1,531 citations

Journal ArticleDOI
TL;DR: In this article, an overview of solar energy systems is represented, and afterwards, applications of hybrid nanofluids in various solar technologies, especially solar thermal, are reviewed in order to gain a deeper insight into the advantages of using nanofluidic systems.
Abstract: Hybrid nanofluids have several advantages compared with the conventional types due to their modified properties. Their enhanced thermophysical and rheological properties make them more appropriate for solar energy systems. In this review paper, an overview of solar energy systems is represented, and afterwards, applications of hybrid nanofluids in various solar technologies, especially solar thermal, are reviewed. Comparison between the nanofluidic systems, and the conventional ones is performed in order to gain a deeper insight into the advantages of using nanofluids. According to the results of the reviewed studies, the most important reason for performance enhancement of nanofluidic solar energy systems can be attributed to the improved thermal properties of the convective fluid. In addition, it can be concluded that the nanofluids’ specifications such as concentration of the nanostructures, type of the solid phase, etc., have significant impact on the behavior of the considered systems.

101 citations

Journal ArticleDOI
TL;DR: In this paper, the authors present the experimental and numerical results on the usage of hybrid nanofluids for heat transfer through micro-scale facing steps, including backward-facing step (BFS), forwardface step (FFS), and microscale steps with different flow regimes and working fluids.

83 citations

Journal ArticleDOI
TL;DR: In this paper, the steady natural convective heat transfer and flow characteristics of Al2O3-Cu/water hybrid nanofluid filled square enclosure in the presence of magnetic field has been investigated numerically.
Abstract: In this paper, steady natural convective heat transfer and flow characteristics of Al2O3-Cu/water hybrid nanofluid filled square enclosure in the presence of magnetic field has been investigated numerically. The enclosure is equipped with a wavy circular conductive cylinder. The natural convection in the cavity is induced by a temperature difference between the vertical left hot wall and the other right cold wall. The steady 2-D equations of laminar natural convection problem for Newtonian and incompressible mixture are discretized using the finite volume method. The effective thermal conductivity and viscosity of the hybrid nanofluid are calculated using Corcione correlations taking into consideration the Brownian motion of the nanoparticles. A numerical parametric investigation is carried out for different values of the nanoparticles volumic concentration, Hartmann number, Rayleigh number, and the ratio of fluid to solid thermal conductivities. According to the results, the corrugated conductive block plays an important role in controlling the convective flow characteristic and the heat transfer rate within the system.

81 citations