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Effects of the Heater Location on the Unsteady Two Dimensional Natural Convection in Enclosures Bounded by Two Paraboloids of Revolution

Using a paraboloidal coordinates system and a vorticity- stream function formulation, the authors study numerically the two-dimensional unsteady natural convection of a Newtonian fluid confined between two paraboloids of revolution with vertical axes. The upwardly open paraboloid is half heated and half insulated. The upper surface downwardly open is completely cooled. Two different cases, based on the position of the hot and the insulated region are considered. A finite volume method is used to approximate the dimensionless equations of vorticity, heat and stream function. A fully implicit scheme is adopted for time discretization and algebraic systems obtained are solved by a successive under relaxation method. The authors analyzed the effects of the Rayleigh number and the active zone location on the convective flow motion and heat transfer. For different Rayleigh numbers, and depending on the position of the active and inert zone, flows observed are very different.


Auteur(s) : samba dia cheikh mbow
Année de publication : 2013
Type : Article
Mise en ligne par : DIA Samba