Modelling capabilities for natural circulation of steam-water flows in submerged tube evaporating bundles of NPP steam generators when using steam and water-air simulators

The problems of modelling natural circulation of steam-water flows in NPP steam generators are considered. Experimental studies were made with staggered and in-line tube banks both enclosed ones, i.e. having the side walls and unlimited freely submerged ones without side walls. The requirements, which should be met when modelling the circulation in steam generators under the conditions studied, are formulated basing on the obtained data analysis