Assessment of an unstructured exponential scheme discrete ordinates radiation model for non-gray media

被引:4
作者
Dembele, S. [1 ]
Lima, K. L. M. [1 ]
Wen, J. X. [1 ]
机构
[1] Kingston Univ, Fac Engn, London SW15 3DW, England
关键词
HEAT-TRANSFER; COMPLEX-GEOMETRY; ENCLOSURES; ABSORPTION; SCATTERING; MESHES; H2O;
D O I
10.1007/s00231-011-0805-9
中图分类号
O414.1 [热力学];
学科分类号
摘要
For radiative transfer in complex geometries, Sakami and his co-workers have developed a discrete ordinates method (DOM) exponential scheme for unstructured meshes which was mainly applied to graymedia. The present study investigates the application of the unstructured exponential scheme to a wider range of non-gray scenarios found in fire and combustion applications, with the goal to implement it in an in-house Computational Fluid Dynamics (CFD) code for fire simulations. The original unstructured gray exponential scheme is adapted to non-gray applications by employing a statistical narrow-band/correlated-k (SNB-CK) gasmodel and meshes generated using the authors' own mesh generator. Different non-gray scenarios involving spectral gas absorption by H(2)O and CO(2) are investigated and a comparative analysis is carried out between heat flux and radiative source terms predicted and literature data based on ray-tracing and Monte Carlo methods. The maximum discrepancies for total radiative heat flux do not typically exceed 5%.
引用
收藏
页码:1349 / 1362
页数:14
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