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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL SIMULATION ON VERTICAL UPWARD GAS-LIQUID ANNULAR FLOW BASED ON THE S-CLSVOF METHOD

Yajun Deng
National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing, 102249, China

Bo Yu
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing, 102617, China

Dongliang Sun
School of Mechanical Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China

Yongtu Liang
National Engineering Laboratory for Pipeline Safety, Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum, Beijing, 102249, China

Abstract

Gas-liquid annular flow is widely encountered in many industrial applications, such as transportation of natural gas and crude oil, gas-liquid separators, heat exchangers, nuclear reactors and U-tubes in steam generators, etc. The flow characteristics of annular flow, especially the entrainment and deposition mechanism, plays an important role in design and optimization of relevant industrial equipments. Based on the open source CFD toolkit OpenFOAM, we developed an improved two-fluid computational fluid dynamics (CFD) model to simulate the vertical upward two-phase annular flow. The gas core is described by a homogeneous mixture consisting of gas phase and droplets, and the film is modeled as a continuous liquid film. The simple coupled Volume of Fluid (VOF) with Level Set (LS) method (S-CLSVOF) is employed to track the interface between the gas core and the liquid film. Then an active scalar equation is introduced to obtain the mass fraction of droplets in the gas core. What's more, the mass transfer between the liquid film and the liquid droplet caused by the entrainment and deposition processes is introduced by source terms of the governing equations. The liquid film thickness, pressure drop, wall shear stress and disturbance wave parameters under different conditions are studied by employing the proposed model. The obtained numerical results show a good agreement with the experimental data reported in the literature.

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