talbi kamel - Academia.edu (original) (raw)
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Prince Mohammad Bin Fahd University, Al Khobar, Saudi Arabia
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Buoyancy-driven magneto hydrodynamic flow in a liquidmetal filled cubic enclosure is investigated... more Buoyancy-driven magneto hydrodynamic flow in a liquidmetal filled cubic enclosure is investigated by three dimensional numerical simulations. The enclosure is heated and cooled along two opposite vertical walls, all other walls being adiabatic. A uniform magnetic field is applied orthogonally to the gravity vector and to the temperature gradient (i.e., parallel to the isothermal walls). The Prandtl number is = 0.019 (characteristic of Galium); the Rayleigh number is made to vary from 10 to 10, the Hartmann number between 30 to 120 and the electrical conductance of the walls between 0 and 1. The Navier–Stokes equations, for the electrical potential, are solved by a finite volume method using the CFD package CFX-4 with some necessary adaptations. Steady-state conditions are assumed. In all cases, a three-dimensional flow with complex secondary motions and a complex current pattern is established. The results show that the dynamic and temperature fields are strongly affected by variati...
This study considers numerical simulations of the combustions of hydrogen and various hydrocarbon... more This study considers numerical simulations of the combustions of hydrogen and various hydrocarbons with air, including 21% oxygen and 79% nitrogen, in a burner and the numerical solution of the local entropy generation rate due to the high temperature and velocity gradients in the combustion chamber. The calculations bring out that the maximum reaction rates decrease with the increase of (or the decrease of ).The large positive and negative temperature gradients occur in the axial direction, nonetheless, the increase of significantly reduces them. The calculations bring out also that with the increase of from 0.5 to 1.0, the volumetric local entropy generation rates decrease about 4%.
Buoyancy-driven magneto hydrodynamic flow in a liquidmetal filled cubic enclosure is investigated... more Buoyancy-driven magneto hydrodynamic flow in a liquidmetal filled cubic enclosure is investigated by three dimensional numerical simulations. The enclosure is heated and cooled along two opposite vertical walls, all other walls being adiabatic. A uniform magnetic field is applied orthogonally to the gravity vector and to the temperature gradient (i.e., parallel to the isothermal walls). The Prandtl number is = 0.019 (characteristic of Galium); the Rayleigh number is made to vary from 10 to 10, the Hartmann number between 30 to 120 and the electrical conductance of the walls between 0 and 1. The Navier–Stokes equations, for the electrical potential, are solved by a finite volume method using the CFD package CFX-4 with some necessary adaptations. Steady-state conditions are assumed. In all cases, a three-dimensional flow with complex secondary motions and a complex current pattern is established. The results show that the dynamic and temperature fields are strongly affected by variati...
This study considers numerical simulations of the combustions of hydrogen and various hydrocarbon... more This study considers numerical simulations of the combustions of hydrogen and various hydrocarbons with air, including 21% oxygen and 79% nitrogen, in a burner and the numerical solution of the local entropy generation rate due to the high temperature and velocity gradients in the combustion chamber. The calculations bring out that the maximum reaction rates decrease with the increase of (or the decrease of ).The large positive and negative temperature gradients occur in the axial direction, nonetheless, the increase of significantly reduces them. The calculations bring out also that with the increase of from 0.5 to 1.0, the volumetric local entropy generation rates decrease about 4%.