Flow pattern and pressure drop for oil–water flows in and around 180° bends

Abstract Pressure drop and flow pattern of oil–water flows were investigated in a 19-mm ID clear polyvinyl chloride pipe consisting U -bend with radius curvature 100 mm. The range for oil water superficial velocities tested was $$0.04 \le U_{{{\text{so}}}} 0.950 \;{\text{m/s}}$$ 0.04≤Uso≤0.950m/s $$0.13 U_{{{\text{sw}}}} 1.10 xmlns:mml="http://www.w3.org/1998/Math/MathML">0.13≤Usw≤1.100.4≤Usw≤0.54<mml:mspace . losses differed various sections, difference strongly linked phases pattern. At high mixture velocity, higher than fully developed flows. low are straight sections. generally decreased level development