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