The full-spectrum -distribution (FSK) approach is a promising model for radiative transfer calculations in participating media. FSK achieves line-by-line (LBL) accuracy for homogeneous media at a tiny fraction of LBL’s high computational cost. However, inhomogeneities in gas temperature, total pressure, and component-gas mole fractions change the spectral distribution of the absorption coefficient and can cause inaccuracies in the FSK approach. In this paper, a new hybrid FSK method is proposed that combines the advantages of the multigroup FSK (MGFSK) method for temperature inhomogeneities in a single gas species and the multiscale FSK (MSFSCK) method for concentration inhomogeneities in gas mixtures. In this new hybrid method, the absorption coefficients of each gas species in the mixture are divided into spectral groups depending on their temperature dependence. Accurate MGFSK databases are constructed for combustion gases, such as and . This paper includes a detailed mathematical development of the new method, method of database construction, and sample heat transfer calculations for 1D inhomogeneous gas mixtures with step changes in temperature and species mole fractions. Performance and accuracy are compared to LBL and plain FSK calculations. The new method achieves high accuracy in radiative heat transfer calculations in participating media containing extreme inhomogeneities in both temperature and mole fractions using as few as spectral groups for each gas species, accompanied by several orders of magnitude lower computational expense as compared to LBL solutions.
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Hybrid Full-Spectrum Correlated -Distribution Method for Radiative Transfer in Nonhomogeneous Gas Mixtures
Gopalendu Pal,
Gopalendu Pal
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802
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Michael F. Modest,
Michael F. Modest
Fellow ASME
Department of Mechanical and Nuclear Engineering,
e-mail: mfmodest@psu.edu
The Pennsylvania State University
, University Park, PA 16802
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Liangyu Wang
Liangyu Wang
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802
Search for other works by this author on:
Gopalendu Pal
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802
Michael F. Modest
Fellow ASME
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802e-mail: mfmodest@psu.edu
Liangyu Wang
Department of Mechanical and Nuclear Engineering,
The Pennsylvania State University
, University Park, PA 16802J. Heat Transfer. Aug 2008, 130(8): 082701 (8 pages)
Published Online: June 3, 2008
Article history
Received:
May 29, 2007
Revised:
October 16, 2007
Published:
June 3, 2008
Citation
Pal, G., Modest, M. F., and Wang, L. (June 3, 2008). "Hybrid Full-Spectrum Correlated -Distribution Method for Radiative Transfer in Nonhomogeneous Gas Mixtures." ASME. J. Heat Transfer. August 2008; 130(8): 082701. https://doi.org/10.1115/1.2909612
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