Phenomenological theory of the kinetics of ultrasonic emulsification

Abstract

A working model is given for the rate of ultrasonic emulsification, considering the dispersion at the interface (area A ) and the coagulations in the volume V of the emulsion. A bimolecular coagulation leads to the equation c=c^∞tanh bt;c^∞=(Aα/Vβ)^½b=(Aα β/V)^½ while a monomolecular coagulation gives c=c^∞{1-exp (-at)}; c^∞=Aα/Vβ;a=β. The experiments on the dependence of c^∞, a and b upon A and V favour the bimolecular coagulation. The results are satisfactorily explained on general theoretical grounds.