‘Electrolysis’ is a technology about the transport of electrons caused by placing electrodes in an electrolyte using the difference of electric potential. It has been applied to various industrial fields, e.g., energy storage systems (ESS), fuel cells, and water treatment. Despite the outwardly simple phenomenon of this technology, it has been investigated because of the complex electro-physical process inside the electrolysis system, which can be designed in various ways. Two plate electrodes placed on a bulk of electrolyte is the most common electrolysis system. The electrolysis systems can be identified by the electrolyte flow, such as Forced convection configuration (FCC), Forced convection-induced circulation configuration (FCICC), and No net flow configuration (NNFC). The purpose of the study about the bubbles around the electrodes was to characterize the potential drop induced by the existence of the bubbles in the electric field. The dispersed bubbles, which have less electrical conductivity than does the bulk of the electrolyte, can reduce the efficiency of electrolysis. Therefore, in order to study the relationship between the electrical properties in the channel and the gas layer, the equation was derived with the void fraction and other electrical variables.

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