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Closed system ---> Column + Vessel

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Dear All,

I would like to created a system where I have a vessel that introduces a chemical species in a saturated column and the output of this chemical species at the column is reintroduce into the vessel. In order to do that I define in COMSOL:

1) A "Transport of Diluted Species in Porous Media" physic (tds) 2) A Global ODEs and DAEs (Vessel) (ge)

I am not sure if for creating the vessel, a global ODEs and DAEs physic is the best, but for me it looks appropriate.

In order to couple them, as boundary condition of my tds physic I will put (ge.variable), and in the ODEs and DAEs physic (ge) I need to solve the following ode:

du/dt = Konstant*(ceffluent - u)

where u is the concentration of the species in the vessel, and ceffluent would be the concentration at the end of the column. The only problem is that I am not completely sure how to define ceffluent, I have tried with tds.c(0.1) but it does not work, actually tds seems to not be adeaquated.

Any help or suggestion with the problem?

Thank you

Best regards, Dani


0 Replies Last Post Jun 29, 2018, 11:59 a.m. EDT
COMSOL Moderator

Hello Daniel Jara Heredia

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