I can't add much, but it is normal to solve n-1 species continuity equations along with the global continuity equation. The nth species density is given by the mixture density minus the n-1 species densities. Then you avoid having two mixture densities.
|
You neglected the species diffusion term.
This is a species transport equation, it is not a chemistry equation. There is nothing here that describes the chemical reaction, in fact the chemistry is an input to this problem in the source term. Normally you label it R as a reaction rate and reserve S for external sources. The species transport equation only describes how the species flow or move around in the domain, it doesn't tell you anything about the reactions the species are undergoing. From the "chemistry equations" and by chemistry equations I mean the set of rate equations that comes from the kinetic model you get a reaction which is the S in the species transport equation. If you are using Arrhenius rate-laws, then this is a big system of coupled ode's that you would solve using some other specialized coupled ode solver. You solve the species transport equation to get a new mass fractions. So no you do not get two new mass fractions. |
All times are GMT -4. The time now is 14:47. |