Particle surface reactions
 

hi want to do simulate CaO + CO2 --> CaCO3.
i enabled species transport --> vol & particle surface reactions.

I added following as species.
Co2 -- vol. species
CaO, CaCO3 -- solid species

I then entered the reaction also in the reactions panel.

But in boundary conditions, i find only volumetric species to give mass fraction details.

How to define the mass fraction of solid species to carry out particle surface reactions?