Effect of moderate DC electric field on formation of surfactant-laden drops

Abstract

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Effect of Ionic Surfactants on the Electrokinetic Control of Viscous Fingering

“…This means that the invading fluid would be drawn backward toward the cathode, thereby increasing the residence time of the surfactant solution and hence leading to a more stable displacement. The increased distortion at higher fields can be explained similar to the behavior of ionic surfactant solution droplets under the influence of electric fields as shown by Kovalchuk et al They observed an increased droplet distortion with increasing magnitude of electric field, and a critical electric field regime was found at which irregularity in the droplets was seen. In our system, we therefore postulate that there is a transition point beyond −300 V/cm, for which instability is further triggered.…”

Impact of external static electric field on surface tension of model solutions

“…Distilled water was first considered as a control solution. Indeed, the value of the surface tension of water at 0 kV is well known in the literature (Kovalchuk, Alberini, and Simmons 2020;Yousif et al 2021;Liu and Cao 2021): it is 72 mN.m -1 . The measurement of the ST of a droplet of water was used as a reference measurement in order to compare it to the measurements made with two other model solutions.…”