Top blowing is a common operation in metallurgical oxidation processes such as those found in steel production. One advantage of this kind of blowing is the absence of any submerged element in the melt. The analysis of fluidynamics and mass transfer usually requires the employment of cold models. Thus, a G/L/L' cold model of a steel converter was accordingly designed that illustrated the presence of emulsions likewise reported in real reactors. The characteristics of this system were studied, namely the kinetics of emulsion formation and destruction. A model was subsequently elaborated for the stages of emulsion formation and destruction.