Natural convection in a horizontal channel provided with heat generating blocks: Discussion of the isothermal blocks validity

Mouhtadi, D.; Amahmid, A.; Hasnaoui, M.; Bennacer, Rachid

doi:10.1016/j.enconman.2011.08.006

Cited by 12 publications

(7 citation statements)

References 26 publications

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“…2. The latter is limited by the fictitious planes P1 and P2 such that it contains two halves of contiguous blocks [11] The boundary conditions associated to this problem are as follows:…”

Section: Problem Statement and Mathematical Formulationmentioning

confidence: 99%

“…A first comparison with a work investigated by Vahl Davis [12] is undertaken. The latter consider a numerical study dealing with the natural convection of air within a cavity, defferentially heated, where the Numoy transfer rate (Table 1) is compared with those of Vahl Davis [12] A second comparison of the results was made with those of Mouhtadi et al [11], for which, the phenomenon of natural convection in a horizontal channel provided with heat generating blocks.l. The numerical results are shown in Figures 3 (a)…”

Section: Code Validationmentioning

confidence: 99%

“…[9] have treated the laminar flow of a Newtonian fluid within a totally and partially porous channel. El Ganaoui and Djebali [10] have simulated flow transitions using lattice-Boltzmann method D. Mouhtadi et al [11] have studied natural convection in a horizontal channel provided with heat generating blocks. Vahl Davis [12] have investigated numerically the natural convection of air in a square cavity a bench mark numerical solution.…”

Section: Introductionmentioning

confidence: 99%

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Simulation of Natural Convection in a horizontal channel with heat sources mounted with porous blocks by the lattice Boltzmann method (MRT-LBM)

et al. 2020

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In this paper, laminar natural convection in a horizontal channel provided with porous blocks periodically distributed on its lower adiabatic surface has been analyzed. This numerical study is based on the multiple-relaxation-time (MRT) Lattice Boltzmann method (LBM). The two-dimensional model D2Q9 is adopted to solve the flow field, while the D2Q5 model is applied to solve the temperature field. The objective of the study is to analyze the effect of the Darcy number (10-1 ≤ Da ≤ 10-6), Rayleigh number (103 ≤ Ra ≤ 107) and the relative porous blocks height (1/8 ≤ D ≤ 1/2). The obtained results show the important effect of these parameters, which cannot be neglected, on both flow and the heat transfer structure, within this kind of channels.

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“…2. The latter is limited by the fictitious planes P1 and P2 such that it contains two halves of contiguous blocks [11] The boundary conditions associated to this problem are as follows:…”

Section: Problem Statement and Mathematical Formulationmentioning

confidence: 99%

Section: Code Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Simulation of Natural Convection in a horizontal channel with heat sources mounted with porous blocks by the lattice Boltzmann method (MRT-LBM)

et al. 2020

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“…In such CFD simulations, the geometries considered usually include a number of protruding heat sources mounted on a channel wall to simulate the electronic components subjected to a cooling medium. [12][13][14][15] This is similar to the scenario of a sintering gas flowing over an array of metal powder compacts in a furnace. Our recent two-dimensional (2D) CFD simulation of gas flow behaviour during the sintering of Al alloys, subject to a number of geometrical constraints, has indicated that the gas flow pattern around samples changes with sample separation distance.…”

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confidence: 93%

CFD modelling of nitrogen gas flow pattern during sintering of Al–7Zn–2.5Mg–1Cu alloy and its effect on distortion

et al. 2014

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The effects of gas flow pattern on the distortion in Al-7Zn-2.5Mg-1Cu alloy were experimentally examined by sintering three rectangular samples, equally spaced 2-40 mm, in each batch at 620uC for 45 min under flowing nitrogen. A three-dimensional (3D) computational fluid dynamics (CFD) model was developed to investigate the gas flow behaviour surrounding three samples during isothermal sintering. Streamlines, gas flowrate into each cavity between two adjacent samples and wall shear stress distribution along the surfaces of each sample were found dependent on sample separation distance. The flow patterns could affect the distortion levels of the three samples by changing the oxygen content in the local sintering atmosphere and the evaporation rates of Mg and Zn from the sintering surfaces. The 3D CFD model developed was also applied to the experimental design of the sintering of six samples to ensure minimum distortion as well as maximum densification.

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“…Many researches on convective heat transport in "T" shaped cavities, with varying boundary conditions, have been reported [9][10][11][12]. Najam et al [10] numerically analyzed mixed convection in a horizontal channel with heated obstacles on the lower surface.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Inclination Angle on Mixed Convection and Heat Transfer in a “T” Shaped Double Enclosure

Mourabit¹,

Meknassi²,

Fekkar³

et al. 2023

Fluid Dynamics &Amp; Materials Processing

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The effect of the tilt angle on mixed convection and related heat transfer in a "T" shaped double enclosure with four heated obstacles on the bottom surface is numerically investigated. The considered obstacles are constantly kept at a relatively high (fixed) temperature, while the cavity's upper wall is cooled. The finite volume approach is used to solve the mass, momentum, and energy equations with the SIMPLEC algorithm being exploited to deal with the pressure-velocity coupling. Emphasis is put on the influence of the tilt angle on the solution symmetry, flow structure, and heat exchange through the walls. The following parameters and related ranges are considered: Rayleigh number 10 4 ≤ Ra ≤ 5.10 5 , tilt angle 0°≤ φ ≤ 90°, Reynolds number 100 ≤ Re ≤ 1000, Prandtl number Pr = 0.72, block height B = 0.5, opening width C = 0.15, and distance between blocks D = 0.5. The results reveal different branches of solutions on varying Re and φ. They also show that the symmetry of the solution regarding the P 2 axis is retained for all cases with no tilt and for values of Re between 100 and 1000.

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Natural convection in a horizontal channel provided with heat generating blocks: Discussion of the isothermal blocks validity

Cited by 12 publications

References 26 publications

Simulation of Natural Convection in a horizontal channel with heat sources mounted with porous blocks by the lattice Boltzmann method (MRT-LBM)

Simulation of Natural Convection in a horizontal channel with heat sources mounted with porous blocks by the lattice Boltzmann method (MRT-LBM)

CFD modelling of nitrogen gas flow pattern during sintering of Al–7Zn–2.5Mg–1Cu alloy and its effect on distortion

Influence of the Inclination Angle on Mixed Convection and Heat Transfer in a “T” Shaped Double Enclosure

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