<![CDATA[A two-phase flow is part of a multi-phase flow. A two-phase flow is defined as a fluid flow consisting of substances of different phases that flow simultaneously in one channel. The two-phases flow has a very complex phenomenon, this is due to interactions between phases, their geometry and orientation (vertical or horizontal). To find out the phenomenon, a numerical study of two-phase flow (water-air) was carried out on a series of vertical pipes, 45o elbow and sloped pipes, which varied in this study was the superficial gas velocity (USG) of 0.031 m/s, 0.068 m/s, 0.109 m/s and 0.157 m/s. Research using Ansys Fluent 16.0 software. The pipe used is a transparent pipe with a diameter of 32 mm and a length of 3000 mm, the elbow used is the elbow 45o. Research using Ansys Fluent 16.0 software. The pipe used is a transparent pipe with a diameter of 32 mm and a length of 3000 mm, the elbow used is the elbow 45o. The results of this study indicate that at superficial air velocity (USG) of 0.031 m / s and 0.068 m / s the flow pattern is a combination of annular flow, slug and slight bubble. Whereas at superficial air velocity (USG) 0.109 m / s and 0.157 m / s flow patterns are annular flow and slug.]]>
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