Transient gas-liquid two-phase flow in pipes with radial influx or efflux

A simplified model for transient gas-liquid flow in pipes with radial influ x or efflux has been developed in this paper. The resulting governing equat ions are essentially hyperbolic with U-tp + c(s) and U-tp - c(s) as their e igenvalues. A finite-difference scheme based on the split coefficient matri x (SCM) approach is applied to solve the mass and momentum balance equation s. Sample numerical simulation runs are performed. Simulation results agree with experimental observations and clearly show the features of variation in pressure drop, liquid holdup, and two-phase velocity during transient an d steady state flow periods. (C) 2001 Elsevier Science B.V. All rights rese rved.