S0803-2-3 配管減肉におけるオリフィス流動場の計測(原子力発電システムおよび要素技術(2)) S0803-2-3 Turbulent Flow Measurement behind the Orifice in Pipe Flow

Contributing the establishment of technical basis for advanced codes and standards for the management of flow accelerated corrosion (FAC)-induced pipe thinning. 3D PIV measurements on orifice downstream flow including the global flow patterns and the influence of forced swirl was performed. There is some correlation between the large-scale motion and the velocity gradient close to the wall. This result shows that the large scale motion has some effect on the pipe thinning mechanism.