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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.249 SNIP: 0.434 CiteScore™: 1.4

ISSN Imprimir: 1940-2503
ISSN On-line: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.v1.i2.30
pages 137-158

A MULTISCALE FULL-SPECTRUM κ-DISTRIBUTION METHOD FOR RADIATIVE TRANSFER IN NONHOMOGENEOUS GAS-SOOT MIXTURES WITH WALL EMISSION

Gopalendu Pal
Mechanical and Aerospace Engineering Department, Florida, Institute of Technology, Melbourne, Florida 32901; Department of Mechanical and Nuclear Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA

RESUMO

The multiscale full-spectrum κ-distribution (MSFSK) method has become a promising method for radiative heat transfer in inhomogeneous media. The scope of the MSFSK method has been limited to radiation calculations involving inhomogeneous gas mixtures only. The objective of this paper is to develop a MSFSK model that is accurate for inhomogeneous mixtures of both gases and nongray particles, such as soot. Soot is added as one more scale in addition to the gas scales. The overlap parameters between scales are calculated by mixing molecular gases with soot particles at the narrowband level. This MSFSK method is also capable of black/gray wall emission. Because wall emission is continuous over the spectrum, similar to radiation from soot, wall emission is treated within the soot scale. Sample calculations are performed for a one-dimensional medium with step changes in species concentration and temperature and also for a two-dimensional axisymmetric medium involving combustion of methane. The MSFSK method is observed to accurately predict heat transfer from inhomogeneous gas−soot mixture with/without wall emission yielding close to line-by-line accuracy with several orders of magnitude less computational cost.


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