Abstract
Heat exchange tubes of helical coil type are utilized in the steam generator of the fast breeder prototype reactor "Monju". The gas-liquid two-phase flow in the tube is affected by the centrifugal acceleration owing to the constant curvature of the tube. This paper presents the flow pattern map obtained by visualization, and the interfacial structure analyzed by stereoscopic image processing for isothermal air-water system. The measurement results have shown that the flow pattern map was widely occupied by slug and plug flows, and the internal liquid slug had asymmetric behavior due to the curvature of the flow.
