Tandem droplet locomotion in a uniform electric field

An isolated charge-neutral droplet in a uniform electric field experiences no net force. However, pair can move response to field-induced dipolar and hydrodynamic interactions. If the droplets are identical, centre of mass remains fixed. Here, we show that if have different properties, motion due non-reciprocal electrohydrodynamic We analyse three-dimensional trajectories using asymptotic theory, assuming spherical large separations, numerical simulations based on boundary integral method. The dynamics be quite intricate depending initial orientation line-of-centres relative applied direction. Drops tend migrate towards configuration with either parallel or perpendicular direction, while coming into contact indefinitely separating. elucidate conditions under which these interaction scenarios take place. Intriguingly, find some cases form (tandem) translates