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首页> 外文期刊>International Journal of Thermal Sciences >Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases
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Radiative heat exchange inside the pulverized lignite fired furnace for the gray radiative properties with thermal equilibrium between phases

机译：粉煤燃烧炉内的辐射热交换具有灰色辐射特性，且相之间具有热平衡

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摘要

The objective of the research was to find if an agreement of the results of a numerical investigation with experimental data could be achieved considering the two-phase medium in thermal equilibrium. Influence of the gray radiative properties on the radiative heat exchange inside pulverized lignite fired furnaces was investigated using the computational fluid dynamics (CFD) code based on a comprehensive mathematical model of the process. Radiative heat exchange was calculated using Hottel's zonal model. Heat transfer rates and wall fluxes increased for small values of the total extinction coefficient, K_t < 0.2 m~(-1); decreased for large values of K_t, K_t > 2.0 m~(-1); and were maximal for moderate values of K_t, 0.2 < K_t < 2.0 m~(-1). Heat transfer rates and wall fluxes decreased with the increase of the scattering albedo, though the decrease was considerable only for ω > 0.5. Agreement with the experimental data was obtained for the moderate values of the K_t and for scattering albedo 0.1 < ω < 0.5.
机译：该研究的目的是发现考虑到热平衡中的两相介质，数值研究结果与实验数据是否可以达成一致。基于过程的综合数学模型，使用计算流体力学（CFD）代码研究了灰色辐射特性对粉煤燃烧炉内辐射热交换的影响。辐射热交换使用Hottel的区域模型进行计算。当总消光系数较小时，传热速率和壁通量增加，K_t <0.2 m〜（-1）。对于较大的K_t值减小，K_t> 2.0 m〜（-1）;对于K_t的中等值，最大值为0.2 0.5时才是相当大的。对于中等值的K_t和散射反照率0.1 <ω<0.5，获得了与实验数据的一致性。

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