The Separator node specifies a domain with only an Electrolyte Phase node being active. This node is typically used to separate two Gas-Electrolyte Compartment domains of 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. This can be done by either using a Bruggeman, Tortuosity, or User defined correlation.