CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   FLUENT (http://www.cfd-online.com/Forums/fluent/)
-   -   radiation heat transfer (http://www.cfd-online.com/Forums/fluent/98945-radiation-heat-transfer.html)

GeHa March 22, 2012 09:09

radiation heat transfer
 
Hi,

I have defined a simple plane model made of a transparent solid material (Energy/DO-model). At one side, a Wall boundary condition with mixed thermal conditions is assigned. The radiation BC type is "opaque". According to the given boundary condition, I have computed the Total Heat Transfer q and the Radiation Heat Transfer (RHT) q_str. A comparison with the values obtained with "Reports>Fluxes> ... Heat Transfer Rate" shows a good agreement regarding the Total Heat Transfer Rate. But the Fluent-result for q_str is about 15 % larger than the value given by "A eps sig (T_infinity^4-T_w^4)" (A is the area of the side with the Wall boundary condition). So my question is:

How does Fluent the Radiative Heat Transfer Rate compute?

Another question: Is there a possibility to get the Radiation Heat Transfer Rate for a specific surface and for a given Wavelength Interval (in a Non-Gray Model)?

Thanks and best regards.

nenazarian September 5, 2012 14:56

Hi

I have a same problem as you.

Have you figure out how does Fluent compute the Radiative Heat Transfer?

Cheers
Negin


All times are GMT -4. The time now is 14:24.