
224 Industrial Air Quality and Ventilation
© 2010 Taylor & Francis Group, LLC
When the cross-section of the chute is largely free of loose material SS
cch
02,
the ow rate of air entering the lower aspirated cowl is the sum total of airow com-
ing together with a material
(5.27)
and the amount of air owing through the free cross-section of the chute
PP RP PR S
ch ch021021 2
2
/, /
0
S
c
(5.28)
where ζ
ch
is the local resistance factor of the chute, and S
c
is the cross-section area of
the material jet entering the lower chute (m
2
).
When particles are thrown off a driving drum rotating with a linear velocity υ
b
,
the value ...