Study on the Dynamic Behavior of Charged Water Droplets in Crude Oil Emulsions Under Electromagnetic Coupling Fields

Electro-dehydration constitutes a crucial stage in crude oil dehydration due to its high efficiency, low energy consumption, broad applicability, and strong compatibility. While electromagnetic coupled fields offer superior dehydration efficiency compared to single electric fields, the dehydration mechanism of emulsions and dynamic characteristics of charged droplets under coupled fields remain unclear. This study employs numerical simulation software to establish a twodimensional model of charged droplets in emulsions, analyzing motion behavior through multiphysics coupling of two-phase flow, electricity, and magnetism. Results indicate that magnetic field addition weakly suppresses lateral motion under DC fields while promoting longitudinal motion and accelerating settling velocity, with electric fields exerting significantly greater influence than magnetic fields. Both lateral and longitudinal displacements scale positively with larger droplet radii. Furthermore, electric field intensity must coordinate with magnetic flux density and droplet size distribution. Based on droplet dynamics under coupled fields, an optimal polaritydependent electromagnetic configuration is proposed.