Title: Numerical simulation of laminar core-annular flow in a 90<sup>°</sup>bend
Abstract: A numerical study, using the volume-of-fluid method, has been made of laminar core-annular flow in a 90 • bend.To verify the numerical method we first compared our results for a single-phase flow in a 90 • bend with numerical results and experimental data given in the literature.The agreement was good.Thereafter a detailed analysis was made of the velocities and pressures occurring in coreannular flow in a 90 • bend.Special attention was given to the influence of the secondary flow perpendicular to the pipe axis.This secondary flow plays an important role in the behaviour of core-annular flow in a curved pipe.