Modeling Nanoparticle Vapor-Phase Synthesis Reaction

How can I model a nanoparticle vapor-phase synthesis reaction?

Modeling formation of nanoparticles contains three important physical processes.
1. Reaction between species
2. Nucleation
3. Growth
A multiphase model (Eulerian or Mixture) with population balance module is necessary to include step 2 and 3. Since nanoparticles do not change the flow dynamics of the gas phase, one can use mixture model assuming the nature of flow as homogeneous.

For more details, please refer to this document.