Abstract
Core-flow tests with a 3000 mPas fuel oil in a 5 cm test facility have revealed important information on the amplitudes and lengths of waves at the oil/water interface. The wavelengths vary considerably with water fraction and oil velocity. Moreover, the flow in the water annulus is turbulent. A previously developed theoretical model for steady core-annular flow in pipes has been extended by incorporating the effect of turbulence in the water film surrounding the oil core. The adapted model predicts the pressure-gradient increase with oil velocity correctly, provided that actual wave amplitudes and wavelengths observed during these tests are used as input data. The possible contribution of inertial effects is discussed.
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