Browsing by Author "Meftah, S."

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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
Coupled radiation and double diffusive convection in nongray Air-CO2 and Air-H2O mixtures in cooperating situations
(Taylor & Francis, 2009) Meftah, S.; Lemonnier, D.; Benbrik, Abderahmane; Ibrahim, A.
This study highlights the interaction between gas radiation and double diffusive convection in cooperating cases. We consider a square differentially-heated cavity filled with nongray air-CO2 or air-H2O mixtures. The governing equations are solved by a finite-difference method. The radiative sources are evaluated by the discrete ordinates method associated to the SLW spectral model. Results obtained for two average concentrations of CO2 and H2O (10% and 25%) show that radiation influences the temperature and concentration fields by creating oblique stratifications. The Nusselt numbers are decreased, whereas the Sherwood numbers are only slightly reduced. These effects are accentuated in air-H2O mixtures
Numerical study of double-diffusion convection coupled to radiation in a square cavity filled with a participating grey gas
(2008) Mezrhab, A.; Lemonnier, D.; Meftah, S.; Benbrik, Abderahmane
This paper presents numerical solutions for the coupled radiation and natural convection heat transfer by double diffusion in a square cavity. The governing differential equations are solved by a finite-volume method, by adopting the SIMPLER algorithm for pressure–velocity coupling. The discrete ordinate method is used in modelling the radiative transfer equation. The working fluid is considered as grey, absorbing, emitting and not scattering. The walls of the enclosure are assumed to be opaque, diffuse and grey. A parametric study is performed to illustrate the influence of the Rayleigh number, the buoyancy number, the Lewis number and the optical thickness on the flow structure, the heat and mass transfer. The results obtained can be used as benchmark solutions for the validation of the codes treating the combined natural convection heat transfer by double diffusion and radiation