Benchmark example for 3D radiation modeling!
Dear all,
I started to work in the field of radiation modeling (fired furnaces) with CFD codes. To verify the radiation models I'm searching a 3Dexample (simple geometry) to benchmark the models. A paper of Timothy W. Tong, published in HTDVol. 203, Developments in radiative heat transfer, ASME 1992 ("Summary on comparison of radiative heat transfer solutions for a specified problem")seems to be one good starting point for me. Within this paper there is discussed the radiative heat flux for fixed fluid properties in a rectangular enclosure for different radiation models. For someone, who is more involved and expearienced in these topics, I have a question: Does this example still serves as a "state of the art" example of judging different radiation models (or exists  years passed by, new methods were modeled...  another well discussed benchmark model, ideally with a comparison also with experimental results? Maybe someone can recommend me a paper reference or some adresses (including www) where I can find additional informations? With best regards KlausPeter 
Re: Benchmark example for 3D radiation modeling!
Hi Peter, You can verify your code on 3D rectangular problem (Selçuk, N. and Kayakol, N., Evaluation of Discrete Ordinates Method for Radiative Transfer in Rectangular Furnaces, Int. J. Heat Mass Transfer, 40, 213222, 1997) or cylindrical problem (Selçuk N. and Kayakol N., Assessment of Discrete Ordinates Method for Radiative Transfer in Cylindrical Furnaces, Second symposium (Int.) on Radiative Heat Transfer, ICHMT, Kusadasi, Türkiye, June, 1997) of Selçuk. The exact solutions are produced by Selçuk. The problem is based on data taken from a largescale perimental furnace with steep temperature gradients typical of operating furnaces.
In these papers you can find answers to your questions about importance of judging different radiation models and validation procedures. Validation studies with experimental data or exact solutions is still main concern. If I can be of further assistance, please let me know. Nuray Kayakol 
Re: Benchmark example for 3D radiation modeling!
Hi, I have a few additional questions regarding thermal radiaton. I am interested in surfacetosurface thermal radiation without interaction with a gas. My application are surface temperature on components in the engine bay. Do you, or anyone else, know any good 3d validation examples?
Regards Anders 
Re: Benchmark example for 3D radiation modeling!
I don't know such a 3D validation example. But absorption coefficient ka(1/m) represents thermal radiation due to gas medium. As ka goes to zero surfacetosurface thermal radiation becomes more dominant than gas radiation. What I mean is this: a 3D code can be applied to both a participating medium (CO2+H2O) and nonparticipating medium (air) by using appropriate ka values.

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