首页> 外文会议>American Society of Mechanical Engineers(ASME) Summer Heat Transfer Conference(HT2005); 20050717-22; San Francisco,CA(UA) >Modification of Planck Black Body Emissive Power and Intensity in Particulate Media Due to Multiple and Dependent Scattering
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Modification of Planck Black Body Emissive Power and Intensity in Particulate Media Due to Multiple and Dependent Scattering

机译:由于多重和相关散射,普朗克黑体在颗粒介质中的发射功率和强度的改变

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Dispersion relation for electromagnetic wave is obtained in particulate media using effective field approximation (EFA) and quasi crystalline approximation (QCA). Due to multiple and dependent scattering the density of states, phase velocity and group velocity of photons are modified. Modification of these parameters modifies the Planck black body equilibrium radiation intensity. This modification affects the temperature and the heat flux predictions in multiple and dependent scattering particulate media. Results show that EFA can accurately capture the dependence of density of states, phase velocity and the group velocity on volume fraction of scatterers whereas QCA can capture the dependence of effective attenuation as well as density of states, phase velocity and the group velocity. Comparisons of the temperature, heat flux, and effective attenuation are made between EFA, QCA and work done by C.L Tien and coworkers. Results show that heat flux and temperature predictions made by models in the literature for multiple and dependent scattering are not correct as these models do not take the modification of the equilibrium intensity into account. Finally we introduce a new model called Dependent Effective Field Approximation (DEFA) which accurately captures the effect of volume fraction on the equilibrium intensity, and effective attenuation. All relations derived in the paper are for spherical particles.
机译:使用有效场近似(EFA)和准晶体近似(QCA)在颗粒介质中获得电磁波的色散关系。由于多重散射和相关散射,所以修改了状态密度,光子的相速度和群速度。这些参数的修改会修改普朗克黑体平衡辐射强度。此修改会影响多种和相关的散射粒子介质中的温度和热通量预测。结果表明,EFA可以准确捕获状态密度,相速度和群速度对散射体体积分数的依赖性,而QCA可以捕获有效衰减以及状态密度,相速度和群速度的依赖性。比较了EFA,QCA和C.L Tien及其同事所做的工作之间的温度,热通量和有效衰减。结果表明,文献中的模型对多重散射和相关散射所做的热通量和温度预测不正确,因为这些模型没有考虑平衡强度的变化。最后,我们引入了一个称为相依有效场近似(DEFA)的新模型,该模型可以准确地捕获体积分数对平衡强度和有效衰减的影响。本文得出的所有关系均针对球形颗粒。

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