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March 18, 2003, 07:17 |
Radiation CFX 5.5
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#1 |
Guest
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Hello
I am working on oven for backing bread. I use P1 radiation method. I would like to look only surface-to-surface radiation without air radiation. Is this posible with CFX5.5? What should I take for absorbtion,scattering and reflection coefficient for air. Could somebody tell me how CFX calculate radiative emission, incident radiation and radiation intensity? Equations pleace. Thanks. |
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March 18, 2003, 12:56 |
Re: Radiation CFX 5.5
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#2 |
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I am not a CFX user, but if you only want to do surface-to-surface radiation, i would recommend not using the P1 method if you want reasonable accuracy; you can probably get qualitative results for transparent media with P1, but heat flux errors could easily approach 30% or more. The P1 approximation is better suited to participating media with large absorption.
If CFX has a discrete ordinates or discrete transfer method, i would recommend using these, even if you only use a very small number of directions. |
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March 18, 2003, 18:34 |
Re: Radiation CFX 5.5
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#3 |
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I agree with Jeff's comments.
The P1 radiation model is not good for surface-to-surface radiation, but produces reasonably good results when the optical thickness >1 (we've used it with reasonable success for gas combustion problems). For optically thin media, discrete transfer/ray trace based models are much better. These will be available in CFX-5.6 (available April ?) Regards, Sharks |
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March 21, 2003, 01:44 |
Re: Radiation CFX 5.5
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#4 |
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Could someone give me useful value for absorbtion,scattering and reflection coefficient for air.
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