Fundamental Examination about the Influence of Turbulent Fluctuation on the Radiative Heat Flux Arriving at the Wall of Industrial Furnaces

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Fundamental examinations were carried out about the influence of turbulent fluctuation of temperature and gas composition on the radiative heat flux arriving at the wall of large-scale industrial furnaces, where the absorption of radiative energy on its path until furnace wall cannot be disregarded. Line-by-line analysis based on detailed absorption line database is utilized in this study to avoid confusing the influence of turbulence radiation interaction and the error raised by radiation models. Paying attention to a typical optical path in radial direction, growth of radiative intensity along the optical path was evaluated for some cases where the fluctuation of temperature and/or gas composition is taken into consideration or neglected. The results show that radiative heat transfer toward the wall of large-scale furnaces is considerably underestimated by neglecting the fluctuation of both temperature and composition. And the negligence of only one of temperature fluctuation or composition fluctuation leads to fair underestimation of almost same level. In addition, whether the spatial correlation of turbulence fluctuation extends to near or far hardly changes the radiative wall heat flux, though the fraction of radiative energy absorbed on the optical path is fairly large in the test case of this study.