Analysis of flow transients in a pipe with sparger and load reduction ring

High-pressure steam flow transients through a pipe with a sparger and a load reduction ring, which is initially occupied by air and water, are analyzed by the method of characteristics (MOC) with consideration of condensation heat transfer. The results of numerical calculation reproduce ABB-Atomʹs experimental results better than those without consideration of heat transfer. Both the spatial and temporal variations of pressure, flow speed, density and acoustical speed are studied. The locus of interfaces of steam/air and air/water are also studied.