Computational fluid dynamics modelling of multiphase flows in double elbow geometries

This study investigates the effects of elbow on transition and development multiphase flow using computational fluid dynamics modelling techniques. The Eulerian - Multifluid VOF model coupled with an Interfacial Area Transport Equation has been employed to simulate air-water two-phase in a pipe two standard 90 degree elbows mounted series. Turbulence were accounted for by RNG k-ε model. separation distance have studied initial slug churn regimes. Computational simulation results phase distribution time series void fraction fluctuations obtained they showed good agreement available experimental data. show that regime, there is no regime transformation upstream downstream elbows. While at occurs different sections domain before after It was noticed irrespective amplitudes frequencies fluctuation become smaller as flows along pipe. Changes between larger regime.