Spectral analysis of various implementations of the exponential wide band model (EWBM) for H 2O-CO 2mixtures

Alexander Maximov*, Mohammad Hadi Bordbar, Timo Hyppänen

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Two different formulations of the exponential wide band model (EWBM) were used to calculate the total and spectral emissivity of H 2O-CO 2 gas mixtures under the air-fired combustion conditions. The first one was the original wide band method with the four region equation (EWBM-4RE), and the second was the numerical integration method (EWBM-IM). Using the statistical narrow band model (SNBM) as a benchmark along with some experimental data, the accuracy of various implementations of the EWBM was analyzed. Generally, the EWBM-IM has more potentiality for spectral predictions. As opposite to the EWBM-4RE, the EWBM-IM approximately reproduces the shape of absorption spectrum of H 2O and CO 2. The accuracy analysis of both formulations of the EWBM was done by applying them to a benchmark which represents the radiative heat transfer in real participating gas in a two-dimensional rectangular enclosure. The EWBM-4RE accompanied with the original spectral parameters was found to be a more accurate model than EWBM-IM for being used in the gray gas radiative modeling. However, the accuracy of the EWBM-IM in the calculation of the total properties could be improved by deriving the new spectral band parameters for EWBM-IM instead of using those which were developed to be used in the original EWBM-4RE.

Original languageEnglish
Pages (from-to)411-419
Number of pages9
JournalInternational Review of Mechanical Engineering
Volume6
Issue number3
Publication statusPublished - 2012
MoE publication typeA1 Journal article-refereed

Keywords

  • Absorption coefficient
  • Exponential wide band model
  • H O-CO mixtures
  • Integration method
  • Spectral absorption
  • Statistical narrow band model

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