ABSTRACT
The practical aspects of the preparation of Liquid 1/Liquid 2 dispersions can be differentiated into two main categories: the mechanical aspects, connected with the question of how to effectively apply a shear to a mixture of immiscible liquids; and the chemical, connected with the problem of which emulsifier to choose and in which concentration. The encounter between two such droplets is essentially the same as that of the coagulation of two spherical solid particles. In cases where the viscosity of the disperse phase is very high there will be no coalescence; when the behavior as undeformable spherical particles is due to a large Laplace pressure, coalescence will take place but is expected to be a very rapid process once coagulation has occurred. Breakup of a droplet will occur under the following conditions: Fluctuations of the velocity in the vicinity of the droplet will induce its surface to oscillate about its spherical equilibrium shape.
