Transport Properties
This node defines the transport properties of the electrolyte. What settings are available is dependent on the transport mechanisms that have been chosen in the Electroanalysis interface topnode (any combination of convection, migration, and diffusion), and includes only the input fields required by the activated transport mechanisms.
Model Inputs
The Temperature is User defined by default. If a Heat Transfer interface is included in the model, alternatively select the temperature for that interface. For example, if a Heat Transfer in Fluids interface is included in the model, the Temperature (ht) option is available.
convection
This section is available when the Convection check box is selected on the interface top node. The Velocity field u (SI unit: m/s) of the solvent is specified as a feature input. The default is User defined, but if a Fluid Flow interface is included in the model, you may select the velocity field for that physics interface. For example, if a Laminar Flow interface is included in the model, the Velocity field (spf) option is available from the list.
Diffusion
Enter the Diffusion coefficient Dc manually, or use a value from the Materials node. The default Diffusion coefficient value is 1e-9 m2/s which is a typical order of magnitude for a species diluted in a liquid aqueous solution.
Migration in Electric Field
You may include Migration by enabling the Migration in electric field check box on the Electroanalysis top node.
Choose the source for where the Electrolyte potential φl (SI unit: V). Note that the migration term in the transport equation is based on the gradient of the electrolyte potential. If there is no spatial variation in φl, the migration term will be zero.
By default the Mobility (s·mol/kg) is set to be calculated based on the species diffusivity and the temperature using the Nernst-Einstein relation.
Only species with a non-negative Charge number zc (dimensionless, but requires a plus or minus sign) will be affected by the migrative transport.