725
experimental images of approach and coalescence phenomena of drop-drop
coalescence under an electrical field. Figure 12 shows the sequence of the image of
drop- interface coalescence under an electric field. The detailed discussion regarding
the mechanism of coalescence and non-coalescence under an electric field is not
part of this chapter. The overall discussion on droplet coalescence presented in this
chapter will help to understand the destabilization mechanism of the water-inoil system.
Fig. 11 Interaction of droplets under electric field. (a) Distance between the droplets vs. time. (b)
Sequence of images of drop-drop coalescence. Electric field 3 kV/cm at frequency 50 Hz
Fig. 12 Sequence of images of drop-interface coalescence under an electric field = 0.5 kV/cm
Stability and Destabilization of Water-in-Crude Oil Emulsion