there are two types of emissivities in radiation modeling internal and external what does it actually mean ?? please reply if possible please suggest me some sites books if any for radiation modelling in fluent

thanks

I'm not 100% sure but I think the external emissivity reffers to what's happening outside your model (you don't even need to activate a radiation model to activate it), whereas the internal emissivity deals with what's happening inside your domain of study only.

I hope someone confirms that. /JB