Physicochemical Analysis at the Interface Between Conductive Solid and Dielectric Liquid for Flow Electrification Phenomenon

At the solid-liquid interface, a charge zone called the electrical double layer (EDL) appears. It is constituted of two zones of opposite sign: one in the solid and another one in the liquid. When a liquid flows through a pipe, an axial streaming current is generated. This current is due to the convection of the charges coming from the EDL. The physicochemical reaction at the solid-liquid interface is one of the most important parameters which control the diffuse layer development inside the liquid and, consequently, the space charge density. In this paper, we present an analysis for the physicochemical reaction in the case of liquid containing additives or impurities partially dissociated into positive and negative ions. The addition of impurities, in our case, is associated with changing both the polarity and the value of the streaming current. Thus, from this difference in streaming current, we will be able to identify the reagent of the oil with the solid material. Furthermore, the effect of streaming potential on the EDL has been undertaken. Moreover, the fully developed space charge density at the wall is calculated with the help of streaming electrification experiments which are conducted in the case of nonfully developed EDL. This procedure can be conducted for the investigation of flow electrification in transformers with oil/metal configurations.