Modeling wave processes at the outflowing of a water coolant with supercritical initial parameters

Numerical simulation of the outflow of a coolant with supercritical initial parameters at a butt-break of high-pressure pipeline is carried out. The results of calculation of the outflow dynamics on a PV-diagram, as well as the pressure evolution are presented. It is shown that the flow rate weakly depends on temperature at its low values (up to 0, 9 Tc). In the second region (from 0, 9 Tc to Tc), the coolant boiling occurs inside the channel, which leads to a sharp drop in the flow rate with increasing temperature. And the third area (above Tc) is typical for the gas coolant outflow, in which the density strongly depends on pressure and temperature.