Figures & data
Figure 1. Plan view of Stage 0 or 1 of the ACI defining angular and radial nozzle arrangement.
Figure 2. Generation of calibrant particles and introduction to impactor inlet.
Figure 3. Measured particle capture efficiency curves for (a) Stages “0” and (b) “1” of the Andersen impactor operated at 28.3 L/min (Roberts and Mitchell Citation2014); the D50 values are 9.0 and 5.8 µm, respectively, in agreement with the generally accepted values (USP, Ph. Eur.).
Table 1. Capture of various sizes of monodisperse microsphere calibration aerosols under each concentric ring for collection plates relating to stages “0” and “1” of an ACI operated at 28.3 L/min.
Table 2. Repeatibility of deposit recovery from ACI stages “0” and “1”; the mean and standard deviation for deposit mass fraction (%) are identified in relation to nozzle ring number.
Figure 4. Air patterns in laminar jet expansion (simplified from Table 7–6 of Blevins, Citation1984).
Figure 5. Schematic diagram of effect of particle inertia on localized mass concentration and size distribution of particles in the cone expansion inlet of the ACI; the larger inertia of the largest particles concentrates them in the central region above the entry to the nozzles, whereas the finest particles move with the circulating flow toward the periphery.
