[hcmosley1]

I have attached pictures of the problem. Basically it is burners heating up a kettle. THe first shows the fluid domin and the second the kettle.

Why do I get radiative heat flux back into the fluid domain? Is this possible or is the model not accurate? best regards.

I though that q rad = emissivity constant x (T-Tinf)
and q convective = h x (T-Tinf)

so how can one be positive and the other not ??

regards