Abstract
This investigation numerically examined the cutoff aerodynamic diameter (da50) and the sharpness (GSD) of the particle collection efficiency curve of impactors with a finite impaction plate diameter. Results revealed that the inertial impactors have a limited cutoff aerodynamic diameter at different air velocities. The extreme value of the cutoff aerodynamic diameter increases with the nozzle diameter (W)/the plate diameter (Dc). The computed da50/Dc values of the impactors increase with W/Dc at various Reynolds numbers (Re) and with the nozzle-toplate distance (S)/Dc when Re is 100. The value of GSD slightly increases with W/Dc for Re of 10 and 100, although the effect of S/Dc on GSD is not evident at various Res. The particle collection efficiency curve of the impactor with a lower Re is less sharp than that with a high Re at various W/Dc and S/Dc values. Statistical equations closely fitted the obtained numerical results for Res of 10–3000. The equations are useful for directly calculating the cutoff aerodynamic diameter and the sharpness of the particle collection efficiency curve for single round-nozzle impactors with a finite impaction Dc.
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