Core-annular oil/water flow: the turbulent-lubricating-film model and measurements in a 5 cm pipe loop |
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| Affiliation: | 1. Petroleum Engineering Department, Colorado School of Mines, CO 80401, USA;2. McDougall School of Petroleum Engineering, The University of Tulsa, Tulsa, OK 74104, USA;3. Institute of Fluid Dynamics, Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Germany;1. School of Nuclear Engineering, Purdue University, 400 Central Drive, West Lafayette 47907, IN, United States;2. NuScale Power LLC, 1100 Circle Blvd., Suite 200, Corvallis 97330, OR, United States |
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| 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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