Industrial Air Quality and Ventilation

274 Industrial Air Quality and Ventilation

© 2010 Taylor & Francis Group, LLC

plant. Dust-laden air was passed through the magnetic grid element at a ow rate

u

∞

= 7 m/s, with a concentration of 500 mg/m

3

(of pellet dust

ρ

1

= 4,000 kg/m

3

) and

the following particulate composition:

Particle size (m)

< 1.4 1.4–4.2 4.2–9.8 9.8–15 15–30 30–45 45–105

Content by mass (%)

1.2 0.7 4.4 7.4 26.3 26 34

Average Stokes number (at median diameter d

50

= 40 m)

k

=

⋅⋅ ⋅

⋅⋅⋅⋅

=

−

−

4000 40 10 7

12 18 15 10 013

10

5

212

6

..

.

.

For a single-row grid, according to Table 5.14, the purely inertial settling factor

(at δ/H = 0.5) would be η

1

= 0.4; for two rows installed in a series, ...