Browsing by Author "Halouane, Y."

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    CFD prediction of hydrogen passive autocatalytic recombiner performance under counter-current flow conditions
    (Elsevier, 2020) Halouane, Y.; Dehbi, A.
    Passive Autocatalytic Recombiners (PAR) are frequently used today as safety devices to mitigate hydrogen risk in confined spaces. The present study aims to investigate by CFD tools the PAR performance under potentially adverse counter-current flow conditions. Experimental data obtained from the THAI+ two-compartment facility are used to validate the numerical simulation. Counter-current flow is created by a fan in the larger vessel which produces a downward flow in the second vessel housing the PAR unit. In the simulation, the H2 reaction rate is computed by a correlation given by the PAR manufacturer, and hence no detailed chemistry is necessary. In agreement with test data, the simulation results show that PAR operation is not hindered by the imposed counter-current flow, although the plume exiting the PAR is somewhat compressed compared to that existing in quiescent atmospheres. It is also found that the computed parameters of interest (reaction rates, mean flow velocities, hydrogen PAR inlet/outlet concentration, temperature, pressure) agree well with the measured data. This confirms the usefulness of using CFD simulations to predict PAR behavior in complex flows and geometries
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    Simulation of a cavity ventilated by air displacement using the lattice boltzmann method
    (Springer, 2023) Arab, A.; Himrane, N.; Hireche, Z.; Halouane, Y.; Ameziani, D.E.
    This work consists in numerically simulating a double diffusive mixed convection in a cavity ventilated by two diagonally opposed openings in the presence of a porous partition, fixed in the middle of its base and modeled by the Darcy-Brinkman-Forchheimer model. The right-side wall is brought to a constant warm temperature while the other walls are kept adiabatic. The Lattice Boltzmann method with a multiple relaxation time (MRT) is used for the mathematical resolution. The results are illustrated in terms of streamlines, isotherms and isoconcentrations as a function of different control parameters (Reynolds number, Rayleigh number) for a Darcy value Da = 10 - 6 and a height of the porous partition Hp = 0.6. The influence of these parameters on the depollution efficiency was also studied. It has been concluded that the optimal pollution efficiency is obtained at maximum Reynolds values related to the incoming air flow. Also, it was possible to approve the efficiency of the model proposed in this study to evacuate the maximum of heat and pollutants to decrease the ambient temperature as well as the concentration of pollutants. This study aims to provide guidelines to the building constructors in order to obtain a better air quality and ensure a good thermal comfort to the occupants