A numerical study of the spectral radiative properties of packed bed with mixed bauxite and silica spheres
A numerical study of the spectral radiative properties of packed bed with mixed bauxite and silica spheres
复制标题
铝土矿和二氧化硅球混合填充床光谱辐射特性的数值研究
DOI：
10.1016/j.ijheatmasstransfer.2023.124025
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发表时间：
2023
影响因子：
5.2
通讯作者：
Zhang, Zhuomin M.
中科院分区：
文献类型：
--
作者：
Chen, Chuyang;Ranjan, Devesh;Loutzenhiser, Peter G.;Zhang, Zhuomin M.
铝土矿和二氧化硅颗粒在聚光太阳能领域的应用越来越受到关注。在这项工作中，进行了蒙特卡罗射线追踪模拟，以预测混合铝土矿和二氧化硅球形颗粒填充床在波长为0.5,2.6,9.0和9.35µm时的辐射特性（吸收，反射率和透射率）。这些波长分别代表可见光、近红外和中红外区域，它们对太阳辐射和热辐射都很重要。采用重复单元柱法对颗粒床进行数学表示。考察了粒子混合比、体积分数和波长对预测辐射性能的影响。将得到的辐射特性输入到反演方法中，反演出有效吸收系数、散射系数以及散射反照率，为后续连续尺度辐射传热分析提供依据。基于蒙特卡罗算法预测的单个粒子的吸收和散射截面，利用独立散射模型获得了粒子的吸收系数和散射反照率。结果表明，独立散射模型对不透明粒子的散射系数预测不足，而对足够高的粒子体积分数的半透明粒子的散射系数预测过高。将独立散射模型计算的辐射特性与粒子床的全蒙特卡罗模拟进行了比较，以检验粒子混合对依赖散射的影响。
Bauxite and silica particles have gained increasing attention for applications in the field of concentrated solar power. In this work, a Monte Carlo ray-tracing simulation is performed to predict the radiative properties (absorptance, reflectance, and transmittance) of packed beds with mixed bauxite and silica spherical particles at wavelengths of 0.5, 2.6, 9.0, and 9.35 µm. These wavelengths are representative for the visible, near-infrared, and the mid-infrared regions that are important for solar and thermal radiation, respectively. A repeating unit-column approach is used to mathematically represent the particle bed. The effects of particle mixing ratio, volume fraction, and wavelength on the predicted radiative properties are examined. The obtained radiative properties are inputted to an inverse method to retrieve the effective absorption and scattering coefficients as well as the scattering albedo, which may be later used in a continuous-scale radiative heat transfer analysis. Furthermore, the independent scattering model is used to obtain the absorption coefficient and scattering albedo based on the absorption and scattering cross sections predicted by a Monte Carlo algorithm for a single particle. It is shown that the independent scattering model underpredicts the scattering coefficient for opaque particles but overpredicts the scattering coefficient for semitransparent particles for sufficiently high particle volume fractions. The radiative properties calculated from the independent scattering model are compared to the full Monte Carlo simulation of the particle bed to examine the influence of particle mixing on dependent scattering.
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DOI：
10.1039/df9603000192
发表时间：
1960
期刊：
Discussions of The Faraday Society
影响因子：
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期刊：
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影响因子：
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影响因子：
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作者：
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