Liqiud level in separator

[andr1976]

As I can deduce, the liquid level specification of a separator in neqsim is by actual volume fraction? Can anyone confirm this perception? If so is there a way to get/set the actual level (by distance from bottom) or is this a a calculation to be done manually on the side?

[EvenSol]

Hi Anders.

I have updated this example with dynamic simulation of a separator to version 3 of neqsim
https://colab.research.google.com/github/EvenSol/NeqSim-Colab/blob/master/notebooks/process/dynamicsimul.ipynb

Q1:
As I can deduce, the liquid level specification of a separator in neqsim is by actual volume fraction

Looking at the code - the liquid level is initialized as volume fraction - in steady state simulation (run method of equipment):

neqsim/src/main/java/neqsim/process/equipment/separator/Separator.java

Line 290 in 1476aa8

liquidLevel = thermoSystem.getPhase(1).getVolume("m3") / (liquidVolume + gasVolume);

And also used like this in dynamic calculations (runTransient):

neqsim/src/main/java/neqsim/process/equipment/separator/Separator.java

Line 384 in 1476aa8

liquidLevel = volumeLoc / (liquidVolume + gasVolume);

So level in this respect is as you say liquid volume fraction.

Q2:
If so is there a way to get/set the actual level (by distance from bottom) or is this a a calculation to be done manually on the side?

Also the LevelTransmitter just reads the level/volume fraction from the separator:

neqsim/src/main/java/neqsim/process/measurementdevice/LevelTransmitter.java

Line 55 in 1476aa8

public double getMeasuredValue(String unit) {

It seems not to be possible as it is now. This should definetly be implemented. I will have a look at this later.

Thanks for pointing at this fact.

Even

[andr1976]

Thanks a lot @EvenSol, I did some mods to make it run in v3 locally as well :-) I don't think it is a big deal, some simple geom calcs can do it externally, but for sure it would be nice to have it implemented