Research of Phase Separation Phenomenon in Two-phase Bubbly Flow in T-Junction

In this paper, we use CFD software ANSYS CFX to simulate the separation phenomena of two-phase（air-water） flowing through branch pipe when the flow pattern in the horizontal pipe is mainly bubble flow for T-junction of AP1000 consisting of ADS-4 and primary loop. The separation ratio, phase profile, pressure profile and velocity profile are obtained, and the effect of different inlet volume fraction and bubble size on the characteristics of separation is also obtained. The results indicate that the phase separation phenomenon at the T-junction position is significant, separation ratio will decrease with an increase of the inlet volume fraction, and there exists a bubble size that makes the phase separation effect most significant for a particular pipe.