NUMERICAL INVESTIGATION OF OIL SLUG TRAPPED IN CAPILLARY TUBE WITH A LEVEL SET METHOD

摘要

An investigation of the motion of oil drops trapped in an axisymmetric capillary tube saturated with water is carried out. The governing equations for core-annular flow are derived in detail. Numerical solutions for capturing the evolution of interface are developed by making use of a level set method. A second-order projection method is applied to obtain the velocity field of the incompressible two-phase flow. The results show the high efficiency of the method and the key role of water film in improving the mobilization of oil slugs.