Accelerative iteration for coupled conductive-radiative heat transfer computation in semitransparent media
Accelerative iteration for coupled conductive-radiative heat transfer computation in semitransparent media
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半透明介质中传导-辐射耦合传热计算的加速迭代
DOI：
10.1016/j.ijheatmasstransfer.2014.11.035
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发表时间：
2015
影响因子：
5.2
通讯作者：
Gao Naiping
中科院分区：
文献类型：
--
作者：
An Wei;Zhu Tong;Gao Naiping
由于强耦合效应和非线性特性，半透明介质中的导热-辐射耦合换热问题往往要耗费大量的计算时间。为了加快这种耦合计算的收敛速度，本文提出了一种加速迭代模型。在能量方程和辐射传递方程的迭代过程中，通过修正介质的温度和入射辐射，提高了迭代效率。即使在边界条件复杂的情况下，也能显著减少半透明介质中导热-辐射耦合计算的计算时间。通过与文献和传统源迭代法的比较，验证了该模型的准确性。研究了传导辐射参数、光学厚度、散射反照率、壁面发射率和边界条件等因素对计算结果的影响。结果表明，该模型的精度是可靠的，对于光学厚度、散射为主、边界条件复杂的介质，其加速效应更为明显。
Due to the intensive coupling effect and non-linear characteristic, coupled conductive–radiative heat transfer problem in semitransparent media always consumes an enormous amount of computing time. In present work, an accelerative iteration model is developed to speed up the convergence process of this kind of coupled calculation. It promotes the iterative efficiency by revising the temperature and incident radiation of media during the iteration of energy equation and radiative transfer equation. It can remarkably reduce the computing time of coupled conductive–radiative heat transfer calculation in semitransparent media, even in the cases with complicate boundary conditions. The accuracy of present model is verified by comparing with literature and traditional source iteration method. The influences of conduction–radiation parameter, optical thickness, scattering albedo, emissivity of walls and boundary conditions are investigated as well. The results indicate that the accuracy of present model is reliable and its accelerative effect is more significant for the optically thick and scattering-dominated media with complicate boundary conditions.