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passive diffusion will only take place, if there is a difference in unbound concentration between the two spaces (plasma and interstitial).
On the other hand, if you set all clearane parameter (hepatic, enzymatic & renal) in your PBPK model to 0 and simulate your system for a long time periode (1000 h or more) you will find that at some point PassiveDiffusionPl2Int will become 0. This is when the system is in equilibrium and the unbound concentration in bothe spaces (here, plasma and interstitial) are equal.
Hope this helps!