The development in field of advanced computing and software analysis tools for modelling the physical phenomenon has led researchers to use Computational Fluid Dynamics (CFD) for modelling of multiphase flows. CFD has become an essential industrial simulation tool for investigating an engineering system which includes design, analysis, fluid flow and performance determination for the system. Multiphase flow is encountered very frequently in flow through pipelines. Majority of oil fields produce

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... both crude and gas and so multiphase flow is very common in petroleum industry. Stratified flow is a special case of multiphase flow in which a fluid of lower density flows over a fluid of higher density. This type of flow has an excellent potential application in reducing the pumping cost of crude transportation and so there is a scope for extensive research in this area. Stratified flow of oil-water system having a density ratio of 0.9 has been modeled in two-dimensional channels. A significant reduction in pressure drop required to pump a particular mass flow rate has been observed on using stratified multiphase flow when compared to single phase flow of oil. The simulations have been performed in a 2-dimensional control volume using ANSYS Fluent 14.5.