Many industrial processes show, in some particular cases, two phase flows. The two phase flow takes place when thermal and physical conditions like heat exchange, pressure drop, viscous stresses, etc., have uncontrolled changes. In other cases the process requires a two phase flow motion like in pipelines for water-cool mixtures. In all these cases literature [1][2][3] shows the flow observed inside the impeller is not properly described by classical Euler's equations. It is still possible to approximately reformulate the Euler's equations [2], when considering the interaction between gas and liquid phase. This analytical approach, even tough incisive, has some important restrictions. It must take into consideration the absence of thermal fluxes between the two phases, the absence of viscous stresses, and that the flow field is one-dimensional. In this way it is possible to see the global behaviour of the two phase flow, but not what the real distribution of the gas phase inside the mobile ducts is and how the flow field changes relating with the gas phase distribution. This paper intends to be an experimental approach in order to individualize the two phase flow field inside the impeller, to understand the interaction between the gas and liquid phases and a correlation between their behaviours: and the energy dissipation phenomena in a centrifugal pump.
