Industrial Air Quality and Ventilation

154 Industrial Air Quality and Ventilation

© 2010 Taylor & Francis Group, LLC

whence, considering

′

===

∞

−−

ζ

η

be b

b

az b

B

bz

1120 2

20

6

3

()

,,,

(4.165)

the following equation is obtained:

a

aa

z

a

z

c

az I

1

2

12

0

3

2

2

0

5

3

2

2

0

2

2

35

54 1

2

−+

+=

, (4.166)

closing the set (Equation 4.163) and enabling us, given a known impulse I, to nd the

constants α, c, A, and z

0

and, therefore, to determine the coefcients a

1

, a

2

, b

1

, and

b

2

(Table 4.1).

In accordance with Equation 4.150, the air ow rate in a jet would equal

Q xB

0

1

3

2

=

−

Re

.

(4.167)

As the data in the nal columns of Table 4.1 indicate, air ow rates calculated using

Equation 4.167, in the area 10 < I < 10

6

, are virtually iden ...