Transport Properties
The settings in this node are dependent on the checkboxes selected under Transport Mechanisms in the Settings window for the Transport of Charge Carriers interface. It includes only the sections required by the activated transport mechanisms.
Electric Field
This section is available when the Electric field drift checkbox is selected. From the Electric field list, select the source of the electric field.
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Enter a value or expression for the Electric field E, which is User defined; this input option is always available.
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Select the electric field solved by another physics interface such as an Electrostatics or Electric Discharge interface that has also been added to the model.
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Or select the option Common model input.
Magnetic Field
This section is available when the Magnetic field drift checkbox is selected. From the Magnetic flux density list, select the source of the magnetic flux density.
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Enter a value or expression for the Magnetic flux density B, which is User defined; this input option is always available.
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Select the magnetic field solved by another physics interface such as a Magnetic Fields interface that has also been added to the model.
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Or select the option Common model input.
Convection
If transport by convection is active, the velocity field of the solvent needs to be specified. Select the source of the Velocity field.
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For User defined, enter values or expressions for the velocity components in the input fields. This input option is always available.
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You can also select the velocity field solved by another interface such as Laminar Flow interface that has also been added to the model.
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Or select the option Common model input.
Drift
This section is available when at least one of the Electric field drift and Magnetic field drift checkboxes is selected. Enter the Charge number zn (dimensionless, but requires a plus or minus sign) for each charge carrier. For Mobility, select the appropriate scalar or tensor type — Isotropic, Diagonal, Symmetric, or Full — and type in the value of expression of the mobility μn.
Diffusion
This section is available when the Diffusion checkbox is selected. Use this section to specify diffusion coefficients describing the diffusion of each charge carrier in the solvent fluid.
Enter a value or expression for the Diffusion coefficient Dn of each charge carrier in the corresponding input field. This can be a scalar value for isotropic diffusion or a tensor describing anisotropic diffusion. Select the appropriate tensor type — Isotropic, Diagonal, Symmetric, or Full — that describes the diffusion transport, and then enter the values in the corresponding element (one value for each charge carrier).