Modelagem de radiação-condução acopladas em misturas de gases reais pelo metodo das ordenadas discretas e aplicação na modelagem de janelas termicas com gases absorventes

AUTOR(ES)

Carlos Teofilo Salinas Sedano

DATA DE PUBLICAÇÃO

2003

RESUMO

Determination of superficial radiative heat flux and volumetric source tenn in real gas media is difficult due the strong dependency of absorption coefficient to wavenumber. One objective of this work is to develop and to apply one method for spectrally radiation-conduction heat transfer solution in homogeneous and non-homogeneous real gases mixtures. Another objective is to apply the method for practical problems in engineering and scientific research. In this work, the method was applied to thermal modeling of a glass window filled with infrared absorbing gases. Radiative transport equation solution is obtained using the discrete ordinates method. An eflicient method for eliminate the. ray effect in complex two-dimensional situations is proposed and the algorithm is validated against different two-dimensional cases. The procedure and algorithm are used in coupled radiation-conduction heat transfer problems. Comparison of results with literature benchmark test cases is done for validation. The next step is to use the numerical -algorithms in the solution for complex cases of radiative heat transfer in non-gray gases and in non-gray gases mixtures where spectrally integration of radiative transport equations is needed. The model of local spectrum correlation is adopted for spectral integration of radiative transport equation. This model supports non-isothermal and non-homogeneous real gases mixtures. Also, it supports gases mixtures with addition of soot. The real gas model and the numeric algorithm are validated for comparison with results taken trom the literature. Finally, the development method is applied for to numerical modeling of the coupled radiation-conduction heat transfers in glazing filled with infrared absorbing gases mixtures. The thermal performance of the glazing is calculated

ASSUNTO(S)

integração numerica calor - condução metodos de simulação radiação

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