Radiation in diesel engines
Does anyone have any experience with modeling radiation heat transfer in diesel engines?? Specifically, any comments regarding the following points will be appreciated:
1) The numerical method used to solve the RTE
2) The radiative properties of the combustion gases and soot (is the gray gas assumption justified or is the spectral dependence important?)
3) Is the optically thin assumption justified?
Any references will be welcomed.
Re: Radiation in diesel engines
Hi, I have no experience with modelling of radiative heat transfer in diesel engines but industrial furnaces and combustors.
some comments: (1) discrete ordinates method as a RTE solver
Ref:M.F. Modest, Radiative Heat Transfer, Mc Graw Hill, Inc,1993 http://michelle.me.psu.edu/ (2) Smith et al.& Leckner total emissivity correlations
for the calculation of absorbtion coefficient of the medium
Ref: T.F Smith, Z.F. Shen, J. N. Friedman, Evaluation of Coefficients for the weighted Sum of gray gases model, J. Heat Transfer, vol 104,1982.
B. Leckner, Spectral and total emissivity of water vapor and carbon dioxide, combustion ans Flame, vol. 19,1972.
Spectral dependency is important but it takes too much timein CFD applications. So total emissivity correlations are used in CFD applications.
Magnussen, B.F. and Hjertager, B.H. "On Mathematical Modeling of Turbulent Combustion with Special Emphasis on Soot Formation and Combustion," 16th International Symposium on Combustion, pp. 719-729, The Combustion Institute, 1976.
Khan I.M.and Greeves, G., "A Method for Calculating the Formation of and Combustion of Soot in Diesel Engines," Heat Transfer In Flames, Ed. Afgan and Beer, pp. 391-404, 1974.
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