The H2 Gas-Electrolyte Compartment and O2 Gas-Electrolyte Compartment nodes specify domains where both an Electrolyte Phase, and a Gas Phase node are active. This node is typically used to model a hydrogen or oxygen evolving electrolyte compartment in a liquid-electrolyte-based electrolyzer.

The bulk electrolyte conductivity defined in the Electrolyte Phase node will be multiplied by a correction factor to compensate for the effect of the Electrolyte volume fraction being less than 1 (caused by the evolving gas). This can be done by either using a Bruggeman, Tortuosity, or User defined correlation. For Tortuosity, select either Isotropic to define a scalar value, or Diagonal or Symmetric to define anisotropic tensor values. This feature is unavailable if Solve for electrolyte phase potential is cleared in the interface top node.

This section is only visible if the Include gas phase diffusion checkbox or the Use Darcy’s law for momentum transport checkbox has been selected in the corresponding Gas Mixture section on the interface top node.

If the Include gas phase diffusion checkbox has been selected, the gas diffusivity defined in the Gas Phase node will be multiplied by a correction factor to compensate for the effect of the Gas pore volume fraction being less than 1 (caused by the evolving gas). This can be done by either using a Bruggeman, Tortuosity, or User defined correlation. For Tortuosity, select either Isotropic to define a scalar value, or Diagonal or Symmetric to define anisotropic tensor values.

If the Use Darcy’s law for momentum transport checkbox has been selected, the Gas permeability is defined in this node.