Numerical correlation for natural convective flows in isothermal heated, inclined and convergent channels for high Rayleigh numbers
Knowledge Area
Mecánica de FluidosSponsors
This research has been supported by the Dirección General de Investigación of ministerio de Educacaión y Ciencia of Spanish Goverment, Through DPI 2003-02719 Project.Publication date
2008-02-05Publisher
Elsevier ScienceBibliographic Citation
KAISER, A.S., ZAMORA, B., VIEDMA, A. Numerical correlation for natural convective flows in isothermal heated, inclined and convergent channels for high Rayleigh numbers. Computers and Fluids [ en línea ].vol. 38, nº1. 5 de Febrero 2008. [ fecha de consulta: 15 de Diciembre de 2008.] Disponible en: http://www.sciencedirect.com. DOI 10.1016/j.compfluid.2007.07.024Keywords
Corrientes de convección turbulentaCanal inclinado convergente
Correlación numérica
Número Rayleigh
Turbulent convective flows
Inclined converging channels
Numerical correlation
Fluid mechanics
Abstract
A numerical study of natural convective flows, mainly for high Rayleigh numbers, in a sloped converging channel, for different inclination and convergence angles has been carried out, taking into account the lacks of the literature on some aspect of this configuration. Two dimensional, laminar, transitional and turbulent simulations were obtained by solving the fully-elliptic governing equations using two different general purpose codes: Fluent and Phoenics. The low-Reynolds K-w turbulence model has been employed. Special amphasis is made on the systematic comparisons of computational results with experimental and numerical data taken from literature for turbulent regime, so as on the transitional conditions, studying the influence of Rayleigh number and channel aspect ratio. A generalized turbulent correlation for the average Nusselt number has been obtained from numerical results in a channel with isithermal hated plates, for symmetric heating conditions. This correlation is valid for ...
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