Establishment of Generalized Correlated-Scattering Model for Radiative Properties of Packed Beds

填充床辐射特性广义相关散射模型的建立

基本信息

批准号：
13650233
负责人：
KAMIUTO Kouichi
金额：
$ 2.24万
依托单位：
Oita University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The present study aims at establishing a generalized correlated-scattering model fot the radiative properties needed for analysis of radiative transfer in packed beds. To this end, the following experimental and theoretical studies have been made:1) Experimental measurements of slab transmittances of packed beds consisting of alumina, silica or polystyrene spheres and inverse analysis of the obtained data using the hemispherical transmittace fitting method2) Experimental measurements of total normal emittances of high-temperature packed beds consisting of carbon steel or alumina spheres and inverse analysis of the obtained data using the directional emittance fitting method3) Establishment of generalized correlated-scattering model for the radiative properties of packed beds; particularly albedo ω^* and asymmetry factor g__〜^*. As a result, we can obtain the following conclusions:1) The values of the albedo and asymmetry factor of alumina, silica and polystyrene bead beds determined by the hemispherical transmittance fitting method are close to those predicted by the correlated scattering model,2) The values of the albedo and asymmetry factor of high-temperature carbon steel and alumina bead beds, of which temperatures were varied from 400 to 870K, are also close to those predicted by the correlated scattering model,3) The developed generalized correlated-scattering model are described as follows:ω^*=P_H+τ_Hγ_3g^^〜^*=[P_Hg^^〜_s+(τ_Hγ_3)g^^〜_1γ_4]/(P_H+τ_Hγ_3)γ_4 = 1+?√<1-φ>Here,γ_3 is a function of the albedo of a single particle and f is a function of the reflective index of a particle. In additin, P_H and τ_H respectively represent the hemispherical reflectivity and hemispherical transmissivity of a particle, whereas g^^〜_S and g^^〜I denote the surface scattering phase function and the refracted scattering phase function, respectively.

本研究旨在建立一个广义相关的散落模型脚，以分析包装床中辐射转移所需的辐射特性。为此，已经进行了以下实验和理论研究：1）通过氧化铝，二氧化硅或聚苯乙烯球体组成的填充床的平板传输的实验测量以及使用半球经过跨度拟合方法对获得的数据进行的数据逆分析2）使用定向发射拟合方法获得的数据3）建立了包装床的辐射特性的广义相关散布模型；特别是反照率ω^*和不对称因子g__〜^*。 As a result, we can obtain the following conclusions:1) The values of the albedo and asymmetry factor of alumina, silica and polystyrene bead beds determined by the hemispherecal transmission fitting method are close to those predicted by the correlated scattering model,2) The values of the albedo and asymmetry factor of high-temperature carbon steel and alumina bead beds, of which temperatures were varied from 400 to 870k，也接近相关散射模型预测的，3）3）开发的广义相关散射模型如下：ω^*= p_h+τ_hγ_3G^^^^*= [p_hg^^^^_s s+（τ_hγ_3）g^_3）g^^^_1γ_1γ__1γ__1γ___H+°+ 1+？√<1-φ>在这里，γ_3是单个粒子的反照率的函数，f是粒子反射索引的函数。在附加素中，p_h和τ_h分别表示粒子的半球反射率和半球传递，而g ^^〜_s和g ^^〜i分别表示表面散射相函数和折射散射相函数。