1. General presentation

1.1 Key concepts

• The most important property of a two-phase flow is its configuration, i.e. the geometric characteristics of the interfaces separating gas and liquid. In principle, this is determined by the boundary conditions imposed and the geometry of the system; in cases where not all boundary conditions are known (e.g. injection conditions, turbulence upstream of the system), the configuration is determined by observation or can sometimes be predicted.

  There are three basic configurations:

  • dispersed configuration: the dispersed phase forms small inclusions (bubbles if gas, drops if liquid) in the other phase, called the continuous phase;

  • separate (or...