Characterization of a Microscale Cascade Impactor

Figures & data

TABLE 1 Design parameters and experimental results for the microscale cascade impactor operated at a flow rate of 0.5 L/min

	Cutpoint (μm)
Stage	Designed	Uncoated	Coated	W (μm)	L (μm)	S/W	V (m/s)	P/Pc	Re		σ
1	1.06	1.19	1.19	374	880	1.5	24.1	0.98	874	0.75	1.37
2	0.55	0.52	0.51	197	880	2	46.5	0.94	1020	0.71	1.39
3	0.26	0.27	0.27	110	880	3	86.2	0.90	1110	0.76	1.47

FIG. 1 Photograph of the fabricated microscale cascade impactor. (Color figure available online.)

FIG. 2 Schematic diagram of the experimental setup. (Color figure available online.)

FIG. 4 Numerically calculated particle trajectories at each impaction stage: (a) first stage (b) second stage (c) third stage. (Color figure available online.)

FIG. 3 Collection efficiencies at each impaction stage. (Color figure available online.)

FIG. 5 Particle losses in a microchannel as a function of the aerodynamic diameter.

FIG. 6 SEM image of the impaction plates at each stage: (a) deposition pattern; (b) first stage; (c) second stage; (d) third stage.