Homogeneous two-phase fluids are simulated in Flownex; the homogeneous mixture model approach assumes that the liquid and gas phases are evenly distributed over the cross-sectional area of the flow path and that the pressure, temperature and velocity of the phases are the same. No distinct flow regimes/patterns are present and the single-phase constitutive equations and correlations can be implemented for the mixture.

The accuracy of the model is enhanced by implementing empirical correlations for the two-phase friction factor and heat transfer. The two phase models are simplistic enough to be used by any engineer and also accurate enough to model most of the general flow encountered in everyday engineering plants. These applications include anything from something as simple as boiler blow off studies or flow balancing in evaporative heat exchanger tubes to complex systems including complete Rankine cycles linked to the auxiliary systems and control.

Two-phase fluid can include both gas and liquid phases simultaneously and two-phase fluids generally have 4 regions of interest:

Within the Flownex solver liquid and gas sections are handled with single phase correlations and two phase and transition regions between two phase and single phases are handled with two phase specific correlations.

Typical Applications