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Development of Radiation Heat Transfer Modeling in Non-gray Media in Industrial Applications
, M.Sc. Thesis Sharif University of Technology ; Darbandi, Masoud (Supervisor)
Abstract
Radiation evaluation in non-gray gaseous media is a very complicated issue. Previous researches have shown that the radiation properties of non-gray gases would strongly depend on the wavelengths. The gray gas assumption is the simplest model to calculate the radiation properties. Dispite simplicity, it is widely used in various industrial applications. In this model the gas radiation properties are assumed no to chang across all wavelengths. Evidently this would results in an inaccurate radiation modeling. Using the Spectral Line-based Weighted-sum-of-gray-gases model, SLW, the spectral behavior of radiation properties of gas is almost taken into account in computations. So the use of this...
Effect of oxygen enrichment in spectral thermal radiation in an unconfined turbulent bluff-body flame
, Article Proceedings of the International Symposium on Radiative Transfer, 3 June 2019 through 7 June 2019 ; Volume 2019-June , 2019 , Pages 83-91 ; 26425629 (ISSN); 9781567004793 (ISBN) ; Barezban, M. B ; Fatin, A ; Bordbar, H ; Sharif University of Technology
Begell House Inc
2019
Abstract
Oxy-fuel combustion is a modern technique to improve the efficiency and reduce environmental penalty of many combustion systems. In the present study, three different approaches of skipping radiation, weighted sum of gray gases (WSGGM), and spectral line based weighted sum of gray gases (SLW) have been used in simulation of an unconfined turbulent bluff-body flame. The model is first validated against existing experimental data and then used to study the effect of oxygen enhancement and different spectral radiation models. Due to small optical thickness of the studied system, predictions of all three different approaches are close. However, by increasing oxygen concentration in the oxidizer...
Effect of oxygen enrichment in spectral thermal radiation in an unconfined turbulent bluff-body flame
, Article Journal of Quantitative Spectroscopy and Radiative Transfer ; Volume 247 , 2020 ; Barezban, M. B ; Fatin, A ; Bordbar, H ; Sharif University of Technology
Elsevier Ltd
2020
Abstract
Oxy-fuel combustion is a modern carbon capture and storage (CCS) technique that improves the combustion process and reduces the environmental penalty of many combustion systems. Evidently, the accurate radiative calculation of oxy-fuel combustion is very important to obtain more improved combustion system designs with less environmental drawbacks. In the present study, a small scale unconfined turbulent bluff-body flame is numerically simulated to calculate the gas radiative properties using three different approaches of ignoring radiation, applying a modified version of the weighted sum of gray gases (WSGG) model, and employing the spectral line based weighted sum of gray gases (SLW) model....