Abstract
The paper presents a description of selected models dedicated to steam
condensing flow modelling. The models are implemented into an in-house
computational fluid dynamics code that has been successfully applied to
wet steam flow calculation for many years now. All models use the same
condensation model that has been validated against the majority of
available experimental data. The state equations for vapour and liquid
water, the physical model as well as the numerical techniques of solution
to flow governing equations have been presented. For the single-fluid
model, the Reynolds-averaged Navier-Stokes equations for vapour/liquid
mixture are solved, whereas the two-fluid model solves separate flow
governing equations for the compressible, viscous and turbulent vapour
phase and for the compressible and inviscid liquid phase. All described
models have been compared with relation to the flow through the Laval
nozzle.
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