Inflow
Use this node to specify the species concentrations at an inlet boundary.
The electrolyte potential can be defined either from Insulation (default) or by a set Potential value.
When the Convection checkbox in the Additional transport mechanisms section on the physics interface node has been selected, a Flux (Danckwerts) option can be used instead of the otherwise always-available Concentration constraint.
The Concentration constraint constrains the concentration values on the boundary by the use of pointwise constraints. The other option, Flux (Danckwerts) can be more stable and fast to solve when high reaction rates are anticipated in the vicinity of the inlet. Oscillations on the solutions can also be avoided in such cases. The latter condition uses a flux boundary condition based on the velocity across the boundary and the concentration values.
In the case of weak acid, weak base, and ampholyte species, the total of the dissociated species concentrations is only required. If Complex Species nodes have been added, the complex species concentrations are computed and subtracted from the complex-forming species automatically.