A numerical study of the natural convection flow arising from a confined thermal source is presented. The physical systemconsidered is a 2D enclosure of square cross-section, containing an isothermal horizontal cylindrical source. The heating body iscentred in the enclosure, and the resulting flow is investigated with respect to the effect of the Prandtl number, for different valuesof the Rayleigh number and of the aspect ratio. The numerical scheme is based on a second order finite-volume discretization ofthe Navier-Stokes equations, solved on orthogonal Cartesian grids. Internal boundaries non-aligned with the grid are subjectedto special treatment. The work focuses on the onset of steady and transitional flows. The asymptotic flow and thermal patternsare investigated, as well as the heat transfer performance of the system
Influence of the Prandtl Number on Buoyancy-Induced Flow and Heat Transfer from an Enclosed Cylindrical Heat Source / Angeli, Diego; Corticelli, Mauro Alessandro; Barozzi, Giovanni Sebastiano. - STAMPA. - (2008), pp. 35-40. (Intervento presentato al convegno XXVI Congresso Nazionale UIT sulla Trasmissione del Calore tenutosi a Palermo nel 23-25 giugno 2008).
Influence of the Prandtl Number on Buoyancy-Induced Flow and Heat Transfer from an Enclosed Cylindrical Heat Source
ANGELI, Diego;CORTICELLI, Mauro Alessandro;BAROZZI, Giovanni Sebastiano
2008
Abstract
A numerical study of the natural convection flow arising from a confined thermal source is presented. The physical systemconsidered is a 2D enclosure of square cross-section, containing an isothermal horizontal cylindrical source. The heating body iscentred in the enclosure, and the resulting flow is investigated with respect to the effect of the Prandtl number, for different valuesof the Rayleigh number and of the aspect ratio. The numerical scheme is based on a second order finite-volume discretization ofthe Navier-Stokes equations, solved on orthogonal Cartesian grids. Internal boundaries non-aligned with the grid are subjectedto special treatment. The work focuses on the onset of steady and transitional flows. The asymptotic flow and thermal patternsare investigated, as well as the heat transfer performance of the system
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