Two-flux method for radiation heat transfer in anisotropic gas-particles media

作     者：WANG Fei CEN Kefa T.Girasole A.Garo G.Gréhan YAN Jianhua 

作者机构：Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China LESPUMR 6614/CORIACNRSUniversitéet INSA de RouenBP1276801Saint Etienne du RouvrayFrance 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2004年第47卷第6期

页      面：625-640页

核心收录：

学科分类：08[工学] 0802[工学-机械工程] 

基　　金：the sponsorship by le Ministère de la Recherche de France the Programme Sino-Francais de Recherches Avancées (PRA E01-06: Combustion propre : aspects numériques et expérimentaux) the National Natural Science Foundation of China (Grant No.N50106015) 

主　　题：radiative transfer two-flux anisotropic 

摘      要：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).