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Artículo

High-Rayleigh heat transfer flow: Thermal stratification analysis and assessment of Boussinesq approach

Corzo, Santiago FranciscoIcon ; Ramajo, Damian EnriqueIcon ; Nigro, Norberto MarceloIcon
Fecha de publicación: 09/2016
Editorial: Emerald
Revista: International Journal Of Numerical Methods For Heat & Fluid Flow
ISSN: 0961-5539
Idioma: Inglés
Tipo de recurso: Artículo publicado

Resumen

Purpose - The purpose of this paper is to assess the Boussinesq approach for a wide range of Ra (10 × 6 to 10 × 11) in two-dimensional (square cavity) and three-dimensional (cubic cavity) problems for air- and liquidfilled domains. Design/methodology/approach - The thermal behavior in "differentially heated cavities" filled with air (low and medium Rayleigh) and water (high Rayleigh) is solved using computational fluid dynamics (CFDs) (OpenFOAM) with a non-compressible (Boussinesq) and compressible approach (real water properties from the IAPWS database). Findings - The results from the wide range of Rayleigh numbers allowed for the establishment of the limitation of the Boussinesq approach in problems where the fluid has significant density changes within the operation temperature range and especially when the dependence of density with temperature is not linear. For these cases, the symmetry behavior predicted by Boussinesq is far from the compressible results, thus inducing a transient heat imbalance and leading to a higher mean temperature. Research limitations/implications - The main limitation of the present research can be found in the shortage of experimental data for very high Rayleigh problems. Practical implications - Practical implications of the current research could be use of the Boussinesq approach by carefully observing its limitations, especially for sensible problems such as the study of pressure vessels, nuclear reactors, etc. Originality/value - The originality of this paper lies in addressing the limitations of the Boussinesq approach for high Rayleigh water systems. This fluid is commonly used in numerous industrial equipment. This work presents valuable conclusions about the limitations of the currently used models to carry out industrial simulations.
Palabras clave: Boussinesq , Cfd , Heat Transfer , High Rayleigh Flow
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/39528
URL: http://www.emeraldinsight.com/doi/abs/10.1108/HFF-05-2016-0176
DOI: http://dx.doi.org/10.1108/HFF-05-2016-0176
Colecciones
Articulos(CIMEC)
Articulos de CENTRO DE INVESTIGACION DE METODOS COMPUTACIONALES
Citación
Corzo, Santiago Francisco; Ramajo, Damian Enrique; Nigro, Norberto Marcelo; High-Rayleigh heat transfer flow: Thermal stratification analysis and assessment of Boussinesq approach; Emerald; International Journal Of Numerical Methods For Heat & Fluid Flow; 27; 9; 9-2016; 1928-1954
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