absorption coefficients for the Mixture model and DO model.
I'm trying to simulate the Mixture model for the fluid flow, and DO model for the solar input. In the mixture model, I need to give properties for individual phases, including optical properties like absorption coefficients. For the single phase model condition, it's straight forward to calculate the absorption coefficients (peoples use Rayleigh/Mie theory). For the mixture model, If I give the value of individual value of phases, the results shows a higher deviation, which is lower for the single phase condition. Is there any rule/formula to calculate this optical properties or the mixture condition?
Lastly, In the mixture model, what will be the phase's velocity? Do they require equal velocity, or the dissimilar velocity?