. Author manuscript; available in PMC: 2016 Feb 11.

Published in final edited form as: Environ Sci Technol. 2011 Jul 13;45(15):6483–6490. doi: 10.1021/es201379a

Table 1.

Physical Characteristics, Flow Parameters and Experimental Results of the Impaction Stage^a

Physical Characteristics
W (cm)	0.053
L (cm)	0.135
S/W	1.9
Flow Parameters
Re	2212
V (cm/sec)	6295
Experimental Results
d₅₀ (μm)	0.295
√Stk₅₀	0.47
σ	1.53
ΔP (kPa)	2.49

Note: W, nozzle width; L, nozzle lengths; S, impaction plate-to-nozzle distance; Re, Reynolds number; V, nozzle air velocity; d₅₀, 50% cutpoint; √Stk₅₀, square root of Stokes number at 50% collection efficiency; σ, collection efficiency curve sharpness; ΔP, pressure drop; Stokes number at the 50% cut-off diameter is calculated as Stk₅₀ = (4ρ_pQd_p²C_c)/(9πnμW³), where d_p is the mobility equivalent particle diameter, and C_c is Cunningham slip correction factor.