Figure 1.

Illustration of the surface charge distribution and the streamlines of the electrohydrodynamic flow inside a drop (38,70) or a vesicle. The corresponding direction of the tangential electric traction is denoted by arrows. (a) Interior fluid less conducting than the exterior one, Λ/S < 1. The resulting shape is oblate because the EHD flow pushes fluid toward the equator; (b) interior fluid more conducting than the exterior one, Λ/S > 1.