Only one component of a multi-component droplet evaporates

[vv1oveu]

I have set four components in the droplet, and I only want one component (liquid aluminum) to evaporate, while the other components do not participate in the evaporation. The component that can evaporate at the same time will also react with oxygen in the fluid (liquid aluminum reacts with oxygen to produce aluminum oxide), increasing the mass of the droplets. May I ask how to modify the parameters here so that only one component can evaporate, and what variables should be used to control the mass exchange between droplets and oxygen components in the air? Thank you for your response.