One-Dimensional void fraction distribution of gas-liquid two-phase flow in a rod bundle

Visualization and void fraction measurement are important to study the behaviors of a two-phase flow. It is often difficult to visualize two-phase flows and to measure void fraction distributions in complicated conduits like a rod bundle. In this study, visualization of two-phase flow in a rod bundle near the spacer were carried out and the void fraction distributions were measured by using neutron radiography system in Japan Atomic Energy Research Institute. Quantitative void fraction distributions in a rod bundle were presented. (author)