## Abstract

Two different formulations of the exponential wide band model (EWBM) were used to calculate the total and spectral emissivity of H _{2}O-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 _{2}O 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 language | English |
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Pages (from-to) | 411-419 |

Number of pages | 9 |

Journal | International Review of Mechanical Engineering |

Volume | 6 |

Issue number | 3 |

Publication status | Published - 2012 |

MoE publication type | A1 Journal article-refereed |

## Keywords

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