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Two phase modelling for industrial applications

Two phase modelling for industrial applications. Prof A.E.Holdø & R.K.Calay. A case study. Multiphase flows Investigation into gravity based oil-water separator Using IPSA model Parametric studies A design tool. A typical separator. Flow mechanisms. Liquid/liquid flow

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Two phase modelling for industrial applications

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  1. Two phase modelling for industrial applications Prof A.E.Holdø & R.K.Calay Fluid Mechanics Research Group

  2. A case study • Multiphase flows • Investigation into gravity based oil-water separator • Using IPSA model • Parametric studies • A design tool Fluid Mechanics Research Group

  3. A typical separator Fluid Mechanics Research Group

  4. Flow mechanisms • Liquid/liquid flow • Density difference Gravitational force • Viscosity difference Viscous shear Fluid Mechanics Research Group

  5. CFD Model Fluid Mechanics Research Group

  6. Boundary conditions • Inlet: water:oil 50:50 • Velocity for the mixture =-.25m/s • Symmetry boundary conditions along y-z plane at x=0 • Outlets: free • All other walls as no-slip walls Fluid Mechanics Research Group

  7. Mesh models Fluid Mechanics Research Group

  8. Comparison of velocity profiles for different mesh models • Variation of velocity at outlet2 Fluid Mechanics Research Group

  9. Variation of oil volume fraction at outlet2 Fluid Mechanics Research Group

  10. Results:Distribution phase volume fraction at x=0, y-z plane Fluid Mechanics Research Group

  11. Velocity contours at y-z mid plane Fluid Mechanics Research Group

  12. Velocity-vectors at mid y-z plane Fluid Mechanics Research Group

  13. Velocity at various locations along the z-axis Fluid Mechanics Research Group

  14. Streamlines Fluid Mechanics Research Group

  15. Parametric comparisons Fluid Mechanics Research Group

  16. Water volume fraction for particle size; .25mm and 1mm Fluid Mechanics Research Group

  17. Different inlet velocity:0.25m/s ; 0.5m/s Fluid Mechanics Research Group

  18. Oil volume fraction0.25m/s; 0.5m/s Fluid Mechanics Research Group

  19. Changing the weir height0.5m; 0.805m Fluid Mechanics Research Group

  20. Conclusions • Convergence is difficult compared to single phase • Mesh, relaxation factor, initialisation affect the solution • Good results for preliminary investigations • Data needed for validation Fluid Mechanics Research Group

  21. Further Modifications • Transient simulation • Models for emulsification, coagulation and bubble formation • Effect of solid particles Fluid Mechanics Research Group

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