Precipitate removal mass flux links are used to transport precipitated mass directly from one pathway to another. Mass can precipitate in a Cell if solubility limits have been defined for the species in the fluid within the Cell.
They are defined by specifying a fractional rate at which the precipitated mass is being moved from one pathway to another. Hence, a precipitate removal mass flux is computed as the precipitated mass of the species in the pathway multiplied by a fractional transfer rate:
Precipitate Removal Mass Flux = Precipitated Cell Mass * Transfer Rate
The Transfer Rate has dimensions of inverse time. The Transfer Rate is specified as a scalar. That is, all precipitate species are transferred at the same rate.
In most applications, the Transfer Rate will simply be input either as a large number (such that any precipitated mass is immediately removed) or a function that alternates between 0 and a large number (such that any precipitated mass is periodically removed, and allowed to accumulate between removals).
Precipitate removal mass flux links are uni-directional (mass can only be transported in one direction). That is, the Transfer Rate must be non-negative.
Note that in most cases, in order to use a Precipitate removal mass flux link you will need to specify a local solubility (a solubility that varies depending where you are in the model).
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Understanding Precipitate Removal Mass Flux Links