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Numerical analysis of radiative heat transfer in an inhomogeneous and non-isothermal combustion system considering H2O/CO2/CO and soot

Wang, Zhenhua; Dong, Shikui; He, Zhihong; Wang, Lei LU ; Yang, Weihua and Sunden, Bengt Ake LU (2017) In International Journal of Numerical Methods for Heat and Fluid Flow 27(9). p.1967-1985
Abstract

Purpose - H2O, CO2 and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H2O, CO2, CO and soot may take important roles in radiative heat transfer. To provide calculations with high accuracy, all of the participating media should be considered non-gray media. Thus, the purpose of this paper is to study the effect of non-gray participating gases and soot on radiative heat transfer in an inhomogeneous and non-isothermal system. Design/methodology/approach - To solve the radiative heat transfer, the fluid flow as well as the pressure, temperature and species distributions were first computed by... (More)

Purpose - H2O, CO2 and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H2O, CO2, CO and soot may take important roles in radiative heat transfer. To provide calculations with high accuracy, all of the participating media should be considered non-gray media. Thus, the purpose of this paper is to study the effect of non-gray participating gases and soot on radiative heat transfer in an inhomogeneous and non-isothermal system. Design/methodology/approach - To solve the radiative heat transfer, the fluid flow as well as the pressure, temperature and species distributions were first computed by FLUENT. The radiative properties of the participating media are calculated by the Statistical Narrow Band correlated Kdistribution (SNBCK), which is based on the database of EM2C. The calculation of soot properties is based on the Mie scattering theory and Rayleigh theory. The radiative heat transfer is calculated by the discrete ordinate method (DOM). Findings - Using SNBCK to calculate the radiative properties and DOM to calculate the radiative heat transfer, the influence of H2O, CO2, CO and soot on radiation heat flux to the wall in combustion system was studied. The results show that the global contribution of CO to the radiation heat flux on the wall in the kerosene furnace was about 2 per cent, but that it can reach up to 15 per cent in a solid fuel gasifier. The global contribution of soot to the radiation heat flux on the wall was 32 per cent. However, the scattering of soot has a tiny influence on radiation heat flux to the wall. Originality/value - This is the first time H2O, CO2, CO and the scattering of soot were all considered simultaneously to study the radiation heat flux in combustion systems.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
K-distribution, Non-gray gas, Radiative heat transfer, Soot scattering, Statistical narrow band
in
International Journal of Numerical Methods for Heat and Fluid Flow
volume
27
issue
9
pages
19 pages
publisher
Emerald Group Publishing Limited
external identifiers
  • scopus:85029916660
  • wos:000411864300004
ISSN
0961-5539
DOI
10.1108/HFF-03-2016-0127
language
English
LU publication?
yes
id
3f04aa96-16ff-4488-8a5c-21193161d309
date added to LUP
2017-10-10 08:10:09
date last changed
2018-01-16 13:22:15
@article{3f04aa96-16ff-4488-8a5c-21193161d309,
  abstract     = {<p>Purpose - H<sub>2</sub>O, CO<sub>2</sub> and CO are three main species in combustion systems which have high volume fractions. In addition, soot has strong absorption in the infrared band. Thus, H<sub>2</sub>O, CO<sub>2</sub>, CO and soot may take important roles in radiative heat transfer. To provide calculations with high accuracy, all of the participating media should be considered non-gray media. Thus, the purpose of this paper is to study the effect of non-gray participating gases and soot on radiative heat transfer in an inhomogeneous and non-isothermal system. Design/methodology/approach - To solve the radiative heat transfer, the fluid flow as well as the pressure, temperature and species distributions were first computed by FLUENT. The radiative properties of the participating media are calculated by the Statistical Narrow Band correlated Kdistribution (SNBCK), which is based on the database of EM2C. The calculation of soot properties is based on the Mie scattering theory and Rayleigh theory. The radiative heat transfer is calculated by the discrete ordinate method (DOM). Findings - Using SNBCK to calculate the radiative properties and DOM to calculate the radiative heat transfer, the influence of H<sub>2</sub>O, CO<sub>2</sub>, CO and soot on radiation heat flux to the wall in combustion system was studied. The results show that the global contribution of CO to the radiation heat flux on the wall in the kerosene furnace was about 2 per cent, but that it can reach up to 15 per cent in a solid fuel gasifier. The global contribution of soot to the radiation heat flux on the wall was 32 per cent. However, the scattering of soot has a tiny influence on radiation heat flux to the wall. Originality/value - This is the first time H<sub>2</sub>O, CO<sub>2</sub>, CO and the scattering of soot were all considered simultaneously to study the radiation heat flux in combustion systems.</p>},
  author       = {Wang, Zhenhua and Dong, Shikui and He, Zhihong and Wang, Lei and Yang, Weihua and Sunden, Bengt Ake},
  issn         = {0961-5539},
  keyword      = {K-distribution,Non-gray gas,Radiative heat transfer,Soot scattering,Statistical narrow band},
  language     = {eng},
  number       = {9},
  pages        = {1967--1985},
  publisher    = {Emerald Group Publishing Limited},
  series       = {International Journal of Numerical Methods for Heat and Fluid Flow},
  title        = {Numerical analysis of radiative heat transfer in an inhomogeneous and non-isothermal combustion system considering H<sub>2</sub>O/CO<sub>2</sub>/CO and soot},
  url          = {http://dx.doi.org/10.1108/HFF-03-2016-0127},
  volume       = {27},
  year         = {2017},
}