(G, p, x, h) model of the inhomogeneous non-equilibrium two-phase flow with quasi-constant slip and its versabile possibilities of application

After summarizing the most important processes in engineering, to which the assumption 'one of the two phases is in a saturated state' is acceptable, a (G, p, x, h) model of a transient one-dimensional inhomogenous non-equilibrium two-phase flow is described. A system of four quasi-linear partial differential equations is obtained. From the stationary part of the system a very simple expression is derived, which defines the local critical mass flow rate. An example of a transient in a WWER-440 type reactor was numerically simulated in order to illustrate the applicability of the model. (author)