Infrared Radiative Properties of Thin Polyethylene Coating Pigmented With Titanium Dioxide Particles
Infrared Radiative Properties of Thin Polyethylene Coating Pigmented With Titanium Dioxide Particles
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DOI：
10.1115/1.4000235
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发表时间：
2010-02
影响因子：
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通讯作者：
Mehdi Baneshi;S. Maruyama;A. Komiya
中科院分区：
文献类型：
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作者：
Mehdi Baneshi;S. Maruyama;A. Komiya
要对TiO 2颜料涂料进行热分析，必须了解TiO 2颜料颗粒的红外辐射特性。通常用于制造着色涂料的树脂在IR波长处具有吸收性，这意味着常规的Mie溶液（MS）在该领域中可能不合适。计算吸收介质中的辐射特性有两种方法：远场近似（FFA）和近场近似（NFA）。在本研究中，在回顾了这两种方法后，我们评估了TiO 2颗粒在聚乙烯树脂作为吸收基质在1.7-15 μm波长范围内的辐射性能的MS，FFA和NFA的基础上。然后，我们计算了不同模型的有效散射和吸收系数。为了研究颗粒尺寸和体积浓度对红外波长透射率的影响，我们采用辐射元法，通过射线发射模型，在各向异性散射的单分散着色层中进行了非灰辐射传热。结果表明，所有三种方法预测类似的结果，在粒径域和体积分数范围内使用的着色涂料。
The infrared (IR) radiative properties of TiO 2 pigment particles must be known to perform thermal analysis of a TiO 2 pigmented coating. Resins generally used in making pigmented coatings are absorbing at IR wavelengths, which means that the conventional Mie solution (MS) may not be adequate in this domain. There are two approaches to evaluating radiative properties in an absorbing medium: far field approximation (FFA) and near field approximation (NFA). In this study, after reviewing these two approaches, we evaluated the radiative properties of TiO 2 particles in polyethylene resin as an absorbing matrix in the wavelength range of 1.7-15 μm based on the MS, FFA, and NFA. We then calculated the effective scattering and absorption coefficients for different models. To investigate the effect of the particle size and volume concentration on the transmittance of IR wavelengths, we made a nongray radiative heat transfer in an anisotropic scattering monodisperse pigmented layer, with independent scattering using the radiation element method by the ray emission model. The results showed that all three approaches predicted similar results in the particle size domain and volume fraction range utilized in pigmented coatings.