Browsing by Author "Cherifi, M."

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Buoyancy ratio effects on coupled radiation and double-diffusive convection in non-gray air-H2O mixtures
(IEEE, 2015) Laouar-Meftah, Siham; Benbrik, Abderahmane; Cherifi, M.; Lemonnier, D.
Contribution to fire protection of the LNG storage tank using water curtain
(IASKS, 2011) Benbrik, Abderahmane; Cherifi, M.; Meftah, S.; Khelifi, M.S.; Sahnoune, K.
In the early years of the oil and gas industry, fire in storage tanks was the common root of most of the incidents. One technique to protect the integrity of neighboring tanks is the water spray curtain, which can provide thermal shielding against fire. This study presents a numerical simulation of radiative heat transfer by the Mont Carlo method through a semitransparent medium (water spray curtain) containing water droplets and gas for the design of an effective thermal shielding system to protect LNG (or combustibles) storage tank from fire. This model will allow us to calculate exactly the attenuation factor of the water curtain as a function of its thickness, density and the size of water droplets. The medium is considered as a non grey, absorbing and anisotropically scattering. The spectral behavior of the medium is taken into account by the Mie theory and the SNB model applied respectively to water droplets and gas (H2O, CO and CO2). The calculated results are satisfactorily in agreement with the experimental data
Effect of horizontal walls emissivity on coupled double diffusive convection and non gray-gas radiation of air-H2O mixture in a cooperating case
(IEEE, 2015) Cherifi, M.; Benbrik, Abderahmane; Laouar-Meftah, Siham; Lemonnier, D.
A hybrid scheme of single relaxation time lattice Boltzmann and finite volume methods coupled with discrete ordinates method for combined natural convection and volumetric radiation in an enclosure
(2020) Soualmi, R; Benbrik, A.; Lemonnier, D.; Cherifi, M.; Bouanani, Mohammed
This paper is focused on the application of hybrid Single relaxation time lattice Boltzmann and finite volume methods in conjunction with discrete ordinates method to simulate coupled natural convection and volumetric radiation in differentially heated enclosure, filled with an absorbing, emitting and non - scattering gray medium. In this work, the velocity and temperature fields are calculated using lattice Boltzmann and finite volume methods respectively, whereas the radiative term is computed by the discrete ordinates method. This study is carried out for Pr = 0.71 , a Rayleigh n umber range of 10 3 ≤ Ra ≤ 10 6 , an optical thickness with values 0 ≤ τ ≤ 100, a Planck number ranging in 0.001≤ Pl ≤ 100 and an aspect ratio varying between 0.5 ≤ Ar ≤ 2. Results are presented in terms of streamlines, isotherms, velocity profiles and averag e Nusselt number. Based on the obtained results, it can be concluded that the presence of volumetric radiation is noteworthy. Its effect, as a function of Rayleigh number and the radiative properties, yields significant changes on the behavior of streamlin es and isotherms. In the taller enclosure, the increase of average total Nusselt number with increasing Rayleigh number is less significant than that in the case of the shallow enclosure.
Interaction between double diffusive natural convection and radiation in a square enclosure with partially active vertical wall
(Digital library International Centre for Heat and Mass Transfer Digital Library, 2016) Cherifi, M.; Benbrik, Abderahmane; Lemonnier, Denis; Meftah, Laouar
A numerical study is performed to investigate the effect of surface and volume radiation on the double diffusive natural convection in a square enclosure with a partially active side wall subjected to opposite and horizontal temperature and concentration gradients. The partially active vertical left side wall and fully active vertical right side wall of the enclosure are maintained at two different but uniform temperatures and concentrations. The remaining boundaries are impermeable and thermally insulated. These walls are assumed to be opaque, diffuse and grey and the working fluid is considered as grey, absorbing, not scattering and emitting thermal radiation. The governing differential equations are solved by a finite-volume method and the SIMPLE algorithm was adopted to solve the pressure–velocity coupling. The discrete ordinates method (DOM) is used to solve the radiative transfer equation within the fluid. Three different relative positions of the active part of the left wall were considered: this parameter has a significant effect on heat and mass transfer as well as the flow structure. The effects of some other influencing parameters have been investigated too, such as the fluid opacity and the mass to thermal buoyancy ratio
Interaction of radiation with double-diffusive natural convection in a three-dimensional cubic cavity filled with a non-gray gas mixture in cooperating cases
(taylor and francis, 2016) Cherifi, M.; Laouar-Meftah, Siham; Benbrik, Abderahmane; Lemonnier, D.; Saury, D.