Page 168 - Industrial Ventilation Design Guidebook
P. 168
I 30 CHAPTER 4 PHYSICAL FUNDAMENTALS
with Eq. (4.237) and the equations defining the mass transfer factors, Eqs.
(4.245) and (4.248) give
If the ideal gas law is used for the gases the concentrations can be shown
by using partial pressures:
where p = p A + p B is the total pressure and y A is the molar fraction of compo-
nent A in the gas. The total concentration c = C A + eg can be expressed in
terms of pressure;
where R = 8.314 J/kmol and T is the temperature (K). Partial pressure p A can
be calculated from
where M^ and M g are the molar masses of components A and B. Equation
(4.246) can be expressed in a form using partial pressures:
Equation (4.247) can then be written as
By using different potential differences,
single-material flow can be written in various ways:
Instead of the molar flow, the mass flow can be used:
With the use of Eqs. (4.255) and (4.256a), the following relationships between
the mass transfer factors are obtained:
Correspondingly, using Eqs. (4.255) and (4.256b) the following is obtained:
