Two-flux method for radiation heat transfer in anisotropic gas-particles media |
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Authors: | Email author" target="_blank">Wang?Fei?Email author Cen?Kefa T?Girasole A?Garo G?Gréhan Yan?Jianhua |
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Affiliation: | 1. Institute for Thermal Power Engineering, Zhejiang University, Hangzhou 310027, China 2. LESP, UMR 6614/CORIA, CNRS, Université et INSA de Rouen, BP12, 76801, Saint Etienne du Rouvray, France |
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Abstract: | Two-flux method can be used, as a simplification for the radiative heat transfer, to predict heat flux in a slab consisting
of gas and particles. In the original two-flux method (Schuster, 1905 and Schwarzschild, 1906), the radiation field was assumed
to be isotropic. But for gas-particles mixture in combustion environments, the scatterings of particles are usually anisotropic,
and the original two-flux method gives critical errors when ignoring this anisotropy. In the present paper, a multilayer four-flux
model developed by Rozé et al. (2001) is extended to calculate the radiation heat flux in a slab containing participating
particles and gas mixture. The analytic resolution of the radiative transfer equation in the framework of a two-flux approach
is presented. The average crossing parameter ε and the forward scattering ratio ζ are defined to describe the anisotropy of
the radiative field. To validate the model, the radiation transfer in a slab has been computed. Comparisons with the exact
analytical result of Modest (1993) and the original two-flux model show the exactness and the improvement. The emissivity
of a slab containing flyash/CO2/H2O mixture is obtained using the new model. The result is identical with that of Goodwin (1989). |
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Keywords: | radiative transfer two-flux anisotropic |
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