[Diger]

So I know there is the possibility for diffusion modelling.
Also accompanied by chemical reactions but is it possible to tell fluent that OH gets lost when hitting the wall? I want to see how the OH distribution evolves when traveling along a duct.
PS: I saw the "wall surface" option under volumetric but I'm not quite sure how I can tell fluent my desires?!

[Diger]

Has anyone an idea how to incorporate wall losses of a species?!?:-(

[Diger]

Ok, so since theres not answer yet I'm trying to answer more specifically.
Atm I'm in the Create/Edit Material for mixture panel and then reaction->edit...
Here I can specify some stuff in particular the wall surface reactions, but what precisely does the "rate exponent" stand for?
is it the exponent of some reaction rate in this sense?
k_AB*[A]^(rate exponent of A)*[B]^(rate exponent of B)
which is usually 1?
PS: Maybe as a side question: when would a rate exponent of a product sepcies in the forward direction be not equal zero?!?

[LuckyTran]

Originally Posted by Diger

Ok, so since theres not answer yet I'm trying to answer more specifically.
Atm I'm in the Create/Edit Material for mixture panel and then reaction->edit...
Here I can specify some stuff in particular the wall surface reactions, but what precisely does the "rate exponent" stand for?
is it the exponent of some reaction rate in this sense?
k_AB*[A]^(rate exponent of A)*[B]^(rate exponent of B)
which is usually 1?
PS: Maybe as a side question: when would a rate exponent of a product sepcies in the forward direction be not equal zero?!?

Yes, that's the rate exponent.

Would you consider this an example? Irreversible, non-linear reactions can have non-zero exponents if the same species is both a reactant and a product. An example is a self-catalytic reactions.

Rate equations are generally approached from a macroscopic approach, which are dominated by diffusion. If you go with a microscopic approach, which is dominated by collisions you can get more of these product dependent forward reactions. A lot of self-assembly methods fall into this category. The question is whether you follow an approach based on convention or a phenomenological approach. Do you consider rate laws as precisely defined and natural reactions must be categorized into one of these definitions or whether natural reactions are absolute and that rate laws are merely ways of describing these natural reactions.