The experimentally observed droplets [6, 13] become lengthened and flattened,
they oscillate with double the frequency of an applied alternating voltage
and their changes are visible by naked eyes. A model of the experimental
set-up [6] is shown in Fig. 1. A conductive water droplet of V = 50 ml lays
on a solid support made of resin which contains two electrodes with the applied
voltage of 2U between them. The upper surface ¡ u describes the droplet
shape. The outer normal relating to the droplet is called n.