Coupled radiation and natural convection: Different approaches of the slw model for a non-gray gas mixture
| Autor: | Assensi Oliva, G. Colomer, R. Cònsul |
|---|---|
| Přispěvatelé: | Universitat Politècnica de Catalunya. Centre Tecnològic de la Transferència de Calor, Universitat Politècnica de Catalunya. Departament de Màquines i Motors Tèrmics, Universitat Politècnica de Catalunya. CTTC - Centre Tecnològic de la Transferència de Calor, Universitat Politècnica de Catalunya. GREENTECH - Grup de Recerca en Tecnologies Renovables |
| Rok vydání: | 2007 |
| Předmět: |
Physics
Convection Radiation Natural convection Convective heat transfer Thermodynamics Física::Termodinàmica [Àrees temàtiques de la UPC] Mechanics Heat transfer coefficient Calor -- Transmissió Thermal conduction Heat -- Convection Atomic and Molecular Physics and Optics Radiation properties SLW Heat - Radiation and absorption Non gray media Calor -- Convecció Heat transfer Radiative transfer Heat -- Transmission DOM Spectroscopy |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) |
| ISSN: | 0022-4073 2003-0797 |
| DOI: | 10.1016/j.jqsrt.2006.12.011 |
| Popis: | The coupling between non-gray radiation heat transfer and convection–conduction heat transfer is studied. The spectral line weighted sum of gray gases model (SLW) is used to account for non-gray radiation properties. The aim of this work is to analyze the influence of the different approaches used when calculating the parameters of the SLW model. Such strategies include the use of optimized model coefficients to reduce the number of operations, and the interpolation of the distribution function instead of the use of mathematical correlations. Non-gray calculations are also compared to gray solutions using the Planck mean absorption coefficient, which can be also calculated with the SLW model. The radiative transfer equation (RTE) is solved by means of the discrete ordinates method (DOM). A natural convection driven cavity is chosen to couple radiation and conduction–convection energy transfer. Several cases, with a significant variation of the ratio between radiation to convection heat transfer, as well as the ratio between radiation to conduction heat transfer, are discussed. The research has been financially supported by the ‘Ministerio de Ciencia y Tecnología’, Spain (Ref. TIC 2003-07970). |
| Databáze: | OpenAIRE |
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