Not really, as you also have a parcel mass to cell (facet) size for momentum and erosion etc. Very simply you need enough parcels such that the particle trajectories can be seen and are sensible, ie modelling a spray cone with 2 streams isn't any good, 20 is probably OK and 100 is likely to be excessive but that will also depend on the size of the cone etc.
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New Post - Reply To: Rule of thumb – DPM #of parcels for my system?