Flux Links to/from External Pathways

In order to integrate the External pathway into your pathway network, you create mass flux links to and from the pathway.

The only way to transport mass out of an External pathway is by specifying an advective mass flux link to another pathway. Diffusive mass flux links from External pathways (diffusive outfluxes) and special purpose (direct transfer, precipitate removal and treatment) mass flux links from External pathways cannot be created.

Note that the flow rate of the fluid defined in an advective mass flux link from a External pathway, if used at all, is only used to determine how mass from a single output vector passed from the External pathway function is apportioned between multiple Outflow flux links

That is, the mass flux link is used only to specify where the mass is to be discharged. The External pathway function itself determines the rate at which mass is discharged to that location.

You can transport mass into an External pathway via an advective mass flux link from any other type of pathway and/or via a diffusive mass flux link from a Cell pathway. Within GoldSim, the concentration and diffusive length on the External pathway side of a diffusive mass flux link are assumed to be zero. Hence, like advective mass flux links, diffusive mass flux links involving External pathways are uni-directional.

Note: When you create an advective mass flux link from an External pathway, GoldSim will assume that the Reference Fluid is the flowing fluid. Note, however, that because the mass flux link is really only used to determine where mass from the External pathway is to be discharged, conceptually the mass flux link can represent any medium (and any type of transport process) you choose. Because all pathways contain a Reference Fluid, you will be able to create an advective mass flux link from an External pathway to any other pathway in the model. Similarly, you can create an advective mass flux link from any pathway in your model to an External pathway, even if the flux link involves a fluid other than the Reference Fluid. That is, unlike advective flux links between other pathway types, GoldSim does not force both pathways to contain the flowing fluid when the link involves an External pathway.