Limits of the Oberbeck–Boussinesq approximation in a tall differentially heated cavity filled with water
The present work assesses the limits of the Oberbeck–Boussinesq (OB) approximation for the resolution of turbulent fluid flow and heat transfer inside a tall differentially heated cavity of aspect ratio G = 6.67 filled with water (Pr = 3.27, Ra = 2.12e11). The cavity models the integrated solar coll...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2014 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/21437 |
| Acceso en línea: | https://hdl.handle.net/2117/21437 https://dx.doi.org/10.1016/j.ijheatmasstransfer.2013.09.046 |
| Access Level: | acceso abierto |
| Palabra clave: | Fluid mechanics Turbulence Non-Oberbeck–Boussinesq effects Turbulent natural convection Differentially heated cavity Mecànica de fluids Turbulència Àrees temàtiques de la UPC::Enginyeria mecànica::Mecànica de fluids |
| Sumario: | The present work assesses the limits of the Oberbeck–Boussinesq (OB) approximation for the resolution of turbulent fluid flow and heat transfer inside a tall differentially heated cavity of aspect ratio G = 6.67 filled with water (Pr = 3.27, Ra = 2.12e11). The cavity models the integrated solar collector-storage element installed on an advanced façade. The implications of the Oberbeck–Boussinesq approximation is submitted to investigation by means of direct numerical simulations (DNS) carried out for a wide range of temperature differences. Non-Oberbeck–Boussinesq (NOB) effects are found to be relevant, especially beyond the temperature difference of 30 °C, in the estimation of heat transfer, stratification, and flow configuration. |
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