Creating and Editing Precipitate Removal Mass Flux Links

• The fractional transfer rate. This is specified in terms of inverse time and must be a scalar (the transfer rate is assumed to be identical for each species). The transfer rate must be non-negative.

Precipitate removal mass fluxes can only originate from a Cell pathway, although they can be sent to any kind of pathway.

Note: Once the mass is transferred to another pathway, it will not necessarily remain precipitated, depending on properties of the pathway. If it is transferred to a Pipe pathway, for example, all the mass will immediately be mobilized (i.e., assumed to be dissolved).

GoldSim provides two ways to create a precipitate removal flux link between two pathways:

The Outflows tab is used to create precipitate removal flux links from the current pathway to other pathways in the model. The Inflows tab is used to create precipitate removal flux links to the current pathway from other pathways in the model.

The two dialogs are almost identical in appearance. The Outflows tab (with a precipitate removal mass flux link) is shown below:

To create a new Outflow (a mass flux link from the current pathway to another pathway), do the following:

3. Press the Add Outflow button. This will bring up a browser showing all of the other pathways (or Containers with pathways) in the model.

5. GoldSim will then display a dialog for selecting the medium involved in the mass flux link:

If you change your mind or have selected the wrong pathway, press the Select… button to change the pathway.

The second field in this dialog is a drop list containing the Reference Fluid in the Outflow ("from") pathway, as well any other media that the two pathways have in common. The Medium drop list will also include several other options, including “Precipitate transfer rate”.

The third field in this dialog specifies the Link Type. If you are connecting two Cells, this will default to Coupled. If the link involves any other type of pathway, it will default to Normal. In most cases, you will not need to change the field and can accept the default.

Select “Precipitate transfer rate” for the Medium (and select a Link Type) and then press OK.

6. You will then be returned to the Outflows tab. Move your cursor to the Properties of Selected Outflow section and enter the Transfer Rate for the link. In this case, this must be a vector by species with dimensions of inverse time, representing the fractional transfer rates for all of the species.

Note: The fraction transfer rates for all the species must be non-negative.

7. If you wish to save the mass flux Final Values or Time Histories for the link, select one or both of the checkboxes.

After an outflow is created, you can always change the properties of the outflow (i.e., the transfer rate and whether or not results are to be saved) by selecting the outflow in the top of the dialog (by clicking on the appropriate row in the List of Outflows) and editing the properties in the lower section of the dialog (Properties of Selected Outflow).

The Inflows and Outflows tab only displays the pathway name, and does not indicate where the pathway exists in the model. If, however, you hold your cursor over a pathway in the list, a tooltip displays the full containment path for the pathway.

Note: A precipitate removal mass flux link can only be created as an Outflow of a Cell pathway. Any kind of pathway, however, can have a precipitate removal mass flux link as an Inflow (i.e., it can receive the mass flux). That is, you can transport mass via a precipitate removal mass flux link only from Cells but to any other kind of pathway.

An outflow is deleted by selecting the outflow in the top of the dialog (by clicking on the appropriate row in the List of Outflows) and pressing the Delete Outflow button.

The Inflows tab can be used to create precipitate removal mass flux links to the current Cell pathway from other Cell pathways in the model. The manner in which inflows are created, edited and deleted is identical to that for outflows, and the two tabs are essentially identical in appearance.

Note that when you create a mass flux link using the Outflows tab of one pathway, the link automatically appears in the Inflows tab of the linked pathway. The properties of the mass flux link can be edited from either location.