Is it possible to use FLUENT to examine the convective flux?
In my case, the porous particle is placed in the air and some reactions happened only in the particle zone. the concentration of species in the particle will be affected by the convective flow and diffusive flow. So far, what I know is that the Fluent can calculate flow rate for each species on certain surface. But it is a "general" flow rate which can not distinguish the amount of convective flow rate and diffusive flow rate.
So, Is it possible to use FLUENT to examine the convective and diffusive flow individually for certain species?
Another question is, when I plot the velocity vector, the direction pointing out which is leaving the system. But when I calculate mass flow rate, it is a positive value (positive means going in the system, right?). The selected area is the same. Is this because I used the wrong coordinate system?