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A Modified Eulerian-Lagrangian Approach Applied to a Compact Down-Hole Sub-Sea Gas-Liquid Separator

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This article presents a modified Eulerian-Lagrangian approach for solving multi-phase flow applied to a laboratory-scale gas-liquid separator designed for high gas content. The separator consists of two concentric pipes with a swirl tube in the annular space between the pipes. The gas-liquid mixture comes from a tangential side inlet and the system works with a combination of gravity and centrifugal forces to achieve a high-efficient gas-liquid separation. In the modified Eulerian-Lagrangian method, gas flow is coupled with the spray and wall film models. The spray model involves multi-phase flow phenomena and requires the numerical solution of conservation equations for the gas and the liquid phase simultaneously. With respect to the liquids phase, the discrete-droplet method (DDM) is used. The droplet-gas momentum exchange, droplet coalesces and breaks-up, and the droplet-wall interaction with wall-film generation and entrainment of the water droplet back into the gas stream are taken into account in this investigation. To be consistent with the experiments the experimental air water mixture on the liquid carry over (LCO) curve is used for the numerical investigation. The standard k-ε turbulence model is used for turbulence closure. The predicted results from the modified Eulerian-Lagrangian multi-phase model explain the complex flow behavior inside the separator and are in good agreement when compared with experiments.
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Keywords: compact gas-liquid separator and multi-phase flow; modified Eulerian-Lagrangian approach

Document Type: Research Article

Affiliations: 1: CSIRO Earth Science and Resource Engineering, Technology Park Kensington, Perth, Western Australia 2: School of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn, Melbourne, Australia

Publication date: 2011-01-01

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