This model might only be used for diluted systems, i.e. in both phases there is one component which has a mole fraction close to one.
In this case the interactions between the components can be neglected and the molar flow rate of a component i only equals the mole fraction gradient of this specific component:
The variables k (mass transfer coefficient) and A (interfacial area) have to be determined in the extending classes, since their determination is column-type dependent.
Modelica
Definition
The code definition for the molar flow rates is as shown below. If the stage is still in start-up modus, by definition all incoming vapour will condense, and a mass transfer equation is only needed on the liquid side. If there is no start-up modus, there is also a mass transfer equation for the vapour side.
for
j in
1:n loop
// Vapour
side
if
considerStartUp and startUp[j]
then
for
i in
1:nSV loop
Ndot_v_interface[j,i] = if j==1
then
-Vdot_v_in*c_v_in[i] else
-Vdot_v[j-1]*c_v[j-1,i];
end
for;
else
for
i in
1:nSV loop
end
for;
end
if;
// Liquid
side
for
i in
1:nSL loop
end
for;
end
for;
| Name | Description |
|---|---|
| ThermoEquilibrium | |
| StateSelection |