Study of two-fluid model and interfacial area

The interfacial transfer terms are the weakest link in a two-fluid-model formulation, because of considerable difficulties in terms of experimentation as well as modeling. However, these terms are of supreme importance for a two-fluid model in determining phase interactions between liquid and vapor. In view of these, the interfacial transfer terms have been studied in detail and new constitutive relations have been developed. The interfacial terms are proportional to the interfacial area and driving force; therefore these two effects are modeled separately. In addition, new flow-regime criteria that are appropriate for a two-fluid model are proposed.