# Benchmark example for 3D radiation modeling!

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 October 22, 1999, 05:45 Benchmark example for 3D radiation modeling! #1 Klaus-Peter Helbig Guest   Posts: n/a 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 3D-example (simple geometry) to benchmark the models. A paper of Timothy W. Tong, published in HTD-Vol. 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 Klaus-Peter

 October 24, 1999, 06:43 Re: Benchmark example for 3D radiation modeling! #3 Anders Jönson Guest   Posts: n/a Hi, I have a few additional questions regarding thermal radiaton. I am interested in surface-to-surface 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

 October 25, 1999, 02:40 Re: Benchmark example for 3D radiation modeling! #4 Nuray Kayakol Guest   Posts: n/a 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 surface-to-surface 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 non-participating medium (air) by using appropriate ka values.