Validation of the STEG Code on Experimental Data Obtained on the PGV-1500 Model

The STEG code is a three-dimensional two-fluid code designed for modeling thermal-hydraulic processes. To study thermal-hydraulic processes in the horizontal steam generator PGV-1500, OKB Gidropress considered a special experimental facility, which is a fragment of the steam generator along the inner surface of a baffle placed in a durable cylindrical vessel. Several experiments were carried out on this facility. One of these experiments is the calculation of the pressure drop and void fraction in the regime with and without heat release from the tube bundle. In this paper, 2 different flow regimes are simulated using STEG code. A new correlation for calculating the drag coefficient is proposed and its results are compared with the Simovic model and the TRACE code model. The results obtained showed that the new correlation works well in all spatial regions of the model.