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首页> 外文期刊>International Journal of Heat and Mass Transfer >Numerical analysis of effective thermal conductivity with thermal conduction and radiation in packed beds
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Numerical analysis of effective thermal conductivity with thermal conduction and radiation in packed beds

机译：填充床中有效热导率及热传导和辐射的数值分析

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摘要

Thermal radiation in a packed bed is controlled by temperature, emissivity, particle size, and bed structure, including void fraction, particle configuration, and the number of contact points. Thus, thermal radiation plays an important role in higher temperature operation of bed reactors. In this study, effect of the radiation/conduction ratio, namely, the Biot number with a thermal radiation coefficient, on effective thermal conductivity was investigated to clarify heat transfer in a packed bed. The Biot number for thermal radiation was defined as a function of temperature, particle size, emissivity, and configuration factor. The results obtained by the homogenization method showed that effective thermal conductivity with thermal radiation is simplified by the Biot number. Finally, the behavior of thermal radiation in the packed bed can be expressed by a sigmoidal function with the Biot number, even though the bed structure is complex.
机译：填充床中的热辐射受温度，发射率，粒度和床结构（包括空隙率，颗粒构型和接触点数）的控制。因此，热辐射在床反应器的较高温度操作中起重要作用。在这项研究中，研究了辐射/传导比（即具有热辐射系数的毕奥数）对有效导热率的影响，以阐明填充床中的传热。热辐射的毕奥数定义为温度，粒度，发射率和构型系数的函数。通过均质化方法获得的结果表明，利用毕奥特数简化了有效的热辐射导热系数。最后，即使床结构很复杂，填充床中的热辐射行为也可以由具有Biot值的S型函数表示。

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