Considering the droplet coalescence

themotion of a group of dispersed droplets inW/O emulsion in a DC electric field is simulated. The simulation demonstrates the evolutions of droplet number

size as well as its distribution

local concentration distribution and droplet size-velocity relationwith the applied time of electric field. The simulated average droplet size is roughly consistent with the experimental value. The simulated variation of droplet number with time under several applied voltages shows that increasing voltage is more effective for raising the rate of droplet coalescence than extending exerting time. However

with the further raise of applied voltage

the improvement in droplet coalescence rate becomes less significant. The evolution of simulated droplet size- velocity relationship with time shows that the inter-droplet electric repulsion force is very strong due to larger electric charge on the droplet under higher applied voltage

so that the magnitude and the direction of droplet velocity become more random

which looks helpful to droplet coalescence.