hi

i'm looking for a simple test case to validate a radiation model. the geometry should be something like a gas filled enclosure with heat conduction in the walls and radiative heat transfer between a "gray" gas and walls. (vaal davis with radiation and heat conduction in walls)

who knows a reference for such or a similar simple problem.

thank you

ulrich

A few test cases can be found at PHOENICS Support Examples page. Look under the heading 'THERMAL RADIATION by IMMERSOL'
You might also like to check out Numerical Heat Transfer, part A, 37, pp 249-270

Regards

Sergei Zhubrin

Some test cases for validation of a radiation model:

(a) 2D rectangular enclosure problem with cold black walls and medium at uniform temperature Ref: N.G Shah, New Method of computation of Radiative Heat Transfer in Combustion Chambers, PhD thesis. University of London, London 1979. (b) 2D cylindrical Delft Furnace Ref: M.G. Carvalho et al, Predicting Radiative Heat Transfer in Absorbing Emitting Scattering Media, ASME HTD Vol. 160, Fundamentals of Radiative Heat Transfer, 17-26, 1991. (c) 3D rectangular enclosure problem with black walls and medium with steep temperature gradients Ref: N. Selcuk and N. Kayakol, Evaluation of Discrete Ordinates Method for Radiative Heat Transfer in Rectangular Furnaces, Int. J. Heat Mass Transfer, Vol. 40, 213-222, 1997

Dr. Nuray Kayakol

thank you for the references.

however, the references does not correspond to what i really need.

I need a simple test case of an enclosure filled with a gas. I have heat conduction in the walls and radiation in the gas ( gas participating in the radiation)

i would be pleased if someone can give me a reference for such a test case

thank you

ulrich bieder

When you say "enclosure" it means 2D or 3D. It is generally known that If gas temperature (or any material like walls) exceeds 500 C gas (or material )will thermally radiate and the radiative heat transfer is predominant mode of heat transfer.

Anyway, you may look at this book:

M. F. Modest, Radiative Heat Transfer,McGraw-Hill, 1993.

his web site is also vey useful. All simple test cases are available.

If you are still looking for the test examples, here is the one as you described it.
Regards
Sergei Zhubrin

salut sergei,

this is exactly what i'm looking for.

thank you very much.

i would be pleased if you can provide me also the physical data of your calculation in order to repeat the test case

ulrich bieder

All settings for the problem listed in PHOENICS User Support Library as "Convection affected by radiation" can be found by inspection of its input file. Click here to download.
If you also take care to download PHOENICS VR-Editor, free of charge, from here, you will be able to inspect (and change if desired) the settings by loading the case and looking-by-clicking through the appropriate windows.
Then, PHOENICS can be run on-line via CHAM's "Remote Computing Service" to get the simulation.

Regards

Sergei Zhubrin