The closure issue in two-phase flow modelling is discussed from various complementary points of view. It is shown that closure of engineering two-phase flow models implies several kinds of closure laws. Some of these laws are of the same nature as the closure laws of single phase flow models. They include equations of state, correlation functions, field viscous and conduction laws and transfer laws. The other closure laws are specific to multiphase flow models. They account for the interface structure and the interface dynamics, and could be called topological laws. They play an essential part in the model behaviour. Except for the equations of state, none of the engineering closure laws is constitutive in the standard sense. The implication of the choice of closure laws are recalled and the closure methods are briefly discussed. The most important topological laws are the void fraction and the interfacial area topological laws. The void fraction topological law, whose essential role is often overlooked, is discussed in some detail.
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J. A. Bouré (1987) studied this question.