How could I model a gas purging the liquid in tanks and pipes? How the interface between Gas and TL could be implemented to achieve purging?

I want to model a process that requires purging to displace the liquid in tanks and pipes. My model would be using a G-TL tank and pipes that fill the tank, a pump to recirculate the liquid, or pump out the content. The tank is also pressurized with gas that is additionally used to purge the system.

Answer 1

[Yifeng Tang]

pushing liquid out from that G-TL tank block is easy, but to do the same purging in pipe (TL) block cannot be done in the same fashion. There is a partially filled pipe block, but that's more for modeling the liquid level of say a vertical pipe.

https://www.mathworks.com/help/hydro/ref/partiallyfilledpipetl.html

In general, Simscape components in the fluids domains (IL, TL, G, 2P, MA) are "filled" with that fluid of the domain.

[Santiago]

Could I connect in some way a gas valve to the TL fluid line as they are actually connected in the process? Or just maybe disregard when the connection is not providing any particular value to characterize the process and using the partially filled pipe for the cases where the purging must be simulated like in this case a long vertical pipe that connects the G-TL product tank with a filler

[Yifeng Tang]

Simscape won't allow connecting different physical domains together directly.

You MAY be able to put two mechanical converter blocks together, one for each fluid domain, and mimic some of the volume displacement effect. How many pipe blocks are we talking about here? Is it one or two or it's a whole network?