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13.4 Separation of Nanoaerosol from the Air 405

0:999

C c ¼ 1 þ Kn p 1:142 þ 0:558 exp
Kn p
kTC c
D p ¼
3pld p
U 0 d f
Pe ¼
D p
The single fiber filtration efficiency by inertial interception and diffusion, per unit
length of fiber is calculated using

1 a R 1:996Kn f
2
g ¼ 0:6 1 þ
it
Y 1 þ R R
g ¼ 0:84Pe 0:43
D

With the face speed of 0.15 m/s, we can get the single mechanism filtration
efficiency for interception, and diffusion. The result is shown in Fig. 13.3.
As seen in Fig. 13.3, diffusion dominates the nanoaerosol particle transport. The
transport efficiency by diffusion increases from nearly 0 to 100 % as the particle size
decreases from 100 to 1 nm.

Fig. 13.3 Calculated
nanoaerosol filtration
efficiency