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**Harvard**

Johansson, R., Andersson, K., Leckner, B. och Thunman, H. (2010) *Models for gaseous radiative heat transfer applied to oxy-fuel conditions in boilers*.

** BibTeX **

@article{

Johansson2010,

author={Johansson, Robert and Andersson, Klas and Leckner, Bo and Thunman, Henrik},

title={Models for gaseous radiative heat transfer applied to oxy-fuel conditions in boilers},

journal={International Journal of Heat and Mass Transfer},

issn={0017-9310},

volume={53},

issue={1-3},

pages={220-230},

abstract={Models of gas radiation properties have been evaluated for conditions relevant to oxy-fired boilers, characterized by larger pressure path-lengths and possibly different ratios of H2O/CO2 compared to air-fired boilers. Statistical narrow band (SNB) models serve as reference. The other radiation models tested are the weighted-sum-of-grey-gases model, the spectral line-based weighted-sum-of-grey-gases model and two grey-gas approximations. The range of validity of the existing coefficients of the weighted-sum-of-grey-gases model is limited, and new coefficients have therefore been determined to cover the conditions of interest. Several assumed test cases, involving both uniform and non-uniform paths, have been studied to evaluate the accuracy of the models. Comparisons with experimental data are also included. The results show that a grey approximation can give accurate wall fluxes, but at the expense of errors in the radiative source term. The weighted-sum-of-grey-gases model with the new coefficients yields predictions within 20% of those of the reference model in most cases, while the spectral line-based weighted-sum-of-grey-gases model usually gives results within 10%. There are, however, discrepancies between the SNB models at high temperatures. The weighted-sum-of-grey-gases model with its low computational cost is recommended for computationally demanding applications where predictions of both wall fluxes and the radiative source term are important.
},

year={2010},

keywords={Gas radiation, Modelling, CFD, Oxy-fuel},

}

** RefWorks **

RT Journal Article

SR Electronic

ID 104749

A1 Johansson, Robert

A1 Andersson, Klas

A1 Leckner, Bo

A1 Thunman, Henrik

T1 Models for gaseous radiative heat transfer applied to oxy-fuel conditions in boilers

YR 2010

JF International Journal of Heat and Mass Transfer

SN 0017-9310

VO 53

IS 1-3

SP 220

OP 230

AB Models of gas radiation properties have been evaluated for conditions relevant to oxy-fired boilers, characterized by larger pressure path-lengths and possibly different ratios of H2O/CO2 compared to air-fired boilers. Statistical narrow band (SNB) models serve as reference. The other radiation models tested are the weighted-sum-of-grey-gases model, the spectral line-based weighted-sum-of-grey-gases model and two grey-gas approximations. The range of validity of the existing coefficients of the weighted-sum-of-grey-gases model is limited, and new coefficients have therefore been determined to cover the conditions of interest. Several assumed test cases, involving both uniform and non-uniform paths, have been studied to evaluate the accuracy of the models. Comparisons with experimental data are also included. The results show that a grey approximation can give accurate wall fluxes, but at the expense of errors in the radiative source term. The weighted-sum-of-grey-gases model with the new coefficients yields predictions within 20% of those of the reference model in most cases, while the spectral line-based weighted-sum-of-grey-gases model usually gives results within 10%. There are, however, discrepancies between the SNB models at high temperatures. The weighted-sum-of-grey-gases model with its low computational cost is recommended for computationally demanding applications where predictions of both wall fluxes and the radiative source term are important.

LA eng

DO 10.1016/j.ijheatmasstransfer.2009.09.039

LK http://dx.doi.org/10.1016/j.ijheatmasstransfer.2009.09.039

OL 30