Vahid Ahmadpour - Academia.edu (original) (raw)
Hi, I’m vahid and l was graduated in Mechanical Engineering with a PhD degree. Now I’m working in a oil-gas oriented company as an senior engineer.
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Cape Peninsula University of Technology, Bellville
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Papers by Vahid Ahmadpour
The purpose of this paper is a numerical study to investigate the effects of external horizontal ... more The purpose of this paper is a numerical study to investigate the effects of external horizontal magnetic field on heat transfer characters within a pure molten metal filled a vertical 3D cylindrical crucible. The inner and outer walls of annulus are kept at constant temperature and the upper and lower walls are thermally insulated. The model is based on magneto hydrodynamic natural-convection theory and low Reynolds number approximation. Finite volume approach and fully implicit scheme is adopted to discrete corresponding equations. Results have been conducted for three different geometrical sizes, Rayleigh and Hartman Numbers. The 3D simulation results indicate a strong relation between heat transfer, the magnetic field strength and the aspect ratio of the crucible. In addition, this model shows that the azimuthal distribution of velocity and temperature fields affected greatly in crucible in presence of external magnetic field. The model has been validated availiable results. The...
Journal of Thermal Engineering, 2021
In the present numerical study, the effect of an external horizontal magnetic field on the natura... more In the present numerical study, the effect of an external horizontal magnetic field on the natural convection of an electrically conducting molten metal (gallium) inside a vertical cylindrical crucible has been investigated. The effect of the external magnetic field is evaluated on the flow pattern and also the temperature field of molten gallium in the mold with an aspect ratio of A=1.0 and a radii ratio of λ=3.0. A series of simulations are carried out for Hartmann numbers of 0, 22.5, 112, and 167 and Rayleigh numbers of 104, 105, and 106. The obtained results show that for a given Rayleigh number, increasing the Hartmann number suppresses convection flows in all directions with different intensities. Moreover, it was found that the employed horizontal magnetic field leads to vanishing the axisymmetric pattern of flow structures. This is due to the formation of Roberts and Hartmann layers near the walls parallel (0° and 180°) and normal (90° and 270°) to the magnetic field, respec...
Journal of the Brazilian Society of Mechanical Sciences and Engineering
The purpose of this paper is a numerical study to investigate the effects of external horizontal ... more The purpose of this paper is a numerical study to investigate the effects of external horizontal magnetic field on heat transfer characters within a pure molten metal filled a vertical 3D cylindrical crucible. The inner and outer walls of annulus are kept at constant temperature and the upper and lower walls are thermally insulated. The model is based on magneto hydrodynamic natural-convection theory and low Reynolds number approximation. Finite volume approach and fully implicit scheme is adopted to discrete corresponding equations. Results have been conducted for three different geometrical sizes, Rayleigh and Hartman Numbers. The 3D simulation results indicate a strong relation between heat transfer, the magnetic field strength and the aspect ratio of the crucible. In addition, this model shows that the azimuthal distribution of velocity and temperature fields affected greatly in crucible in presence of external magnetic field. The model has been validated availiable results. The...
Journal of Thermal Engineering, 2021
In the present numerical study, the effect of an external horizontal magnetic field on the natura... more In the present numerical study, the effect of an external horizontal magnetic field on the natural convection of an electrically conducting molten metal (gallium) inside a vertical cylindrical crucible has been investigated. The effect of the external magnetic field is evaluated on the flow pattern and also the temperature field of molten gallium in the mold with an aspect ratio of A=1.0 and a radii ratio of λ=3.0. A series of simulations are carried out for Hartmann numbers of 0, 22.5, 112, and 167 and Rayleigh numbers of 104, 105, and 106. The obtained results show that for a given Rayleigh number, increasing the Hartmann number suppresses convection flows in all directions with different intensities. Moreover, it was found that the employed horizontal magnetic field leads to vanishing the axisymmetric pattern of flow structures. This is due to the formation of Roberts and Hartmann layers near the walls parallel (0° and 180°) and normal (90° and 270°) to the magnetic field, respec...
Journal of the Brazilian Society of Mechanical Sciences and Engineering