Fluid movement of liquid through a pipe arch supported by a drop in pressure caused by the inertia of the fluid and the secondary flow across the pipe bends. For Newtonian flow, pressure gradient near the wall area is the trigger for the secondary flow. Bend pipe has a value greater than the pressure drop due to the straight pipe geometry and track changes that have an impact on changes in the flow pattern to form separate flow resulting from the inner side of the pipe bends, this study aims to

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... determine the pattern of two-phase fluid flow (water-air) and pressure drop that occurs at 900 curves. Research methods by varying the volumetric proportion of gas (β) of 25-50%, the air discharge (QG) of 1, 2, and 3 Liter Per Menit (LPM) and water discharge (QL) that affect fluid flow pattern and two-phase flow pressure drop in the pipe bends 900. The data obtained were carried out data processing and analysis using statistical analysis. The results obtained can be concluded that the greater the proportion of volumetric air (β) then water Reynolds number (Resl) decreases, causing friction between the large phase, due to the greater frictional force will increase the pressure drop and also cause instability water fluid (flow pattern) in turn 900. The centrifugal force caused by the 900 turn influence on the frictional forces between the phase interfaces pressed together with the emergence of a certain thickness. The smaller the water Reynolds number (Resl), the greater the thickness of the interface, the interface thickness greater then also affect the greater pressure drop.