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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.

本文旨在建立一个适用于分析填充床内辐射传递所需的辐射特性的广义相关散射模型。为此，进行了以下实验和理论研究：1）氧化铝、二氧化硅和聚苯乙烯球填充床平板透过率的实验测量和半球透过率拟合法的反分析; 2）碳钢和氧化铝球填充床高温总法向发射率的实验测量和定向发射率拟合法的反分析; 3）填充床辐射特性的广义相关散射模型的建立;特别是ω ω^* 和不对称因子g_ω ^*。结果表明：1）用半球透射率拟合法测定的氧化铝、二氧化硅和聚苯乙烯珠床的透射率和不对称因子值与关联散射模型的预测值接近; 2）在400 ~ 870 K温度范围内，高温碳钢和氧化铝珠床的透射率和不对称因子值也与关联散射模型的预测值接近; 3）建立的广义关联散射模型为：ω^*=P_H+τ_Hγ_3 g ^^H ^*=[P_Hg^^H_s+（τ_Hγ_3）g^^H_1 γ_4]/（P_H+τ_Hγ_3）γ_4 = 1+？这里γ_3是单个粒子的折射率的函数，f是粒子的反射率的函数。此外，P_H和τ_H分别表示粒子的半球反射率和半球透射率，g^^ε_S和g^^ε_I分别表示粒子的表面散射相函数和折射散射相函数。