Numerical Simulation of Droplet Dynamics under Electric Field Based on SPH Method

An smooth particle hydrodynamics (SPH) model suitable for droplet dynamics under the action of an electric field was establishd, and the accuracy of the model was verified. This model was used to study the effect of electric field intensity on droplet coalescence time. The results showed that as the electric field intensity increased, the degree of polarization deformation during droplet contact increased, which was not conducive to droplet fusion. When the electric field intensity was too high, the droplets would undergo fragmentation. When the electric field strength reached 2 860 kv/m, the droplet particles moved quickly to the edge wall. Before the droplet expanded to the surrounding area at its end, it had already broken, and the breaking time of the droplet tended to stabilize. When the electric field strength reached 3 580 kV/m, the two ends of the droplet were subjected to greater electric field forces, and the droplet was rapidly stretched and deformed. The droplet breaked directly into two sub droplets on the left and right from the middle part. When the diameter of the droplet reached 6 mm, the suppression of droplet stretching deformation by the solid wall boundary was significantly enhanced, and the breaking time of the droplet increased rapidly.