ABSTRACT

There are two basic approaches to multiphase flow modelling: mixture models and two-fluid models. Mixture models (such as the drift-flux model) rely heavily on empiricism, with little attempt to characterize the underlying flow physics. On the other hand, two-fluid models develop closure relationships based much more directly on flow physics.

This paper will present an argument that these two approaches are – in principle – the same. Thus, techniques used to develop mixture models can be used in two-fluid models and vise versa. A principle finding of this work is that there appear to be terms missing from the general two-fluid model formulation related to wave dynamics which are needed to reconcile two-fluid models with drift-flux models.

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