Industrial Air Quality and Ventilation

364 Appendix

© 2010 Taylor & Francis Group, LLC

averaging of physical parameters of these particles in a valid approximation. There

are two ways of averaging the parameters that describe the i-component: either in the

full volume or in a portion of the volume lled with the i-component. For instance,

for density, the rst case is

ρ

ip

= n

i

m

i

, (A.1)

and the second is

ρ

i

= n

i

m

i

⁄ β

i

, (A.2)

where n

i

is a number of particles of the i-component in the unit volume; m

i

is the

weight of particles of the i-component; and β

i

is a fraction of the mixture volume

lled with particles of the i-component.

Thus, in the rst case, we have a partial density, and in the second case, we

have the true density of particles of the i-component. There is an apparent ...