A critical aspect of operating an oil well consists of separating oil from the water that is jointly produced. This paper describes modeling of a crossflow filtration hydrocyclone (CFFH), a device that combines desirable attributes of a crossflow filter and a vortex separator into one unit to separate oil from produced water. A porous media is incorporated around the crossflow outlet region of the cylindrical CFFH so as to achieve the desired separation efficiency. The main purpose of this work is to predict the fluid dynamic behavior of a particular CFFH design and its separation efficacy based on 3D computational fluid dynamics (CFD) simulations. The velocity field in the fluid phase is obtained using a Reynolds Stress Model (RSM) for closing the Reynolds Average Navier-Stokes (RANS) equation. The Lagrangian Discrete Phase Model (DPM) is used to investigate the trajectories of particles mimicking oil droplets and grade efficiency of the CFFH. The effect of the Reynolds and the Stokes numbers on the grade efficiency and particle residence time is studied. The effective length of the porous media and the vortex strength for different operating conditions is also investigated. Results indicate that the separation efficiency is significantly influenced by the porous media. Hydrocyclones with an aspect ratio greater than 4.0 exhibit lower grade efficiency due to a weaker swirl.
- Fluids Engineering Division
Simulations and Performance of the Crossflow Filtration Hydrocyclone (CFFH) for Oil-Water Separation
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Motin, A, Gaustad, MD, Tarabara, VV, & Bénard, A. "Simulations and Performance of the Crossflow Filtration Hydrocyclone (CFFH) for Oil-Water Separation." Proceedings of the ASME 2013 Fluids Engineering Division Summer Meeting. Volume 1C, Symposia: Gas-Liquid Two-Phase Flows; Industrial and Environmental Applications of Fluid Mechanics; Issues and Perspectives in Automotive Flows; Liquid-Solids Flows; Multiscale Methods for Multiphase Flow; Noninvasive Measurements in Single and Multiphase Flows; Numerical Methods for Multiphase Flow; Transport Phenomena in Energy Conversion From Clean and Sustainable Resources; Transport Phenomena in Materials Processing and Manufacturing Processes; Transport Phenomena in Mixing; Turbulent Flows: Issues and Perspectives. Incline Village, Nevada, USA. July 7–11, 2013. V01CT18A004. ASME. https://doi.org/10.1115/FEDSM2013-16195
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