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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 Prof A.E.Holdø & R.K.Calay Fluid Mechanics Research Group
A case study • Multiphase flows • Investigation into gravity based oil-water separator • Using IPSA model • Parametric studies • A design tool Fluid Mechanics Research Group
A typical separator Fluid Mechanics Research Group
Flow mechanisms • Liquid/liquid flow • Density difference Gravitational force • Viscosity difference Viscous shear Fluid Mechanics Research Group
CFD Model Fluid Mechanics Research Group
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
Mesh models Fluid Mechanics Research Group
Comparison of velocity profiles for different mesh models • Variation of velocity at outlet2 Fluid Mechanics Research Group
Variation of oil volume fraction at outlet2 Fluid Mechanics Research Group
Results:Distribution phase volume fraction at x=0, y-z plane Fluid Mechanics Research Group
Velocity contours at y-z mid plane Fluid Mechanics Research Group
Velocity-vectors at mid y-z plane Fluid Mechanics Research Group
Velocity at various locations along the z-axis Fluid Mechanics Research Group
Streamlines Fluid Mechanics Research Group
Parametric comparisons Fluid Mechanics Research Group
Water volume fraction for particle size; .25mm and 1mm Fluid Mechanics Research Group
Different inlet velocity:0.25m/s ; 0.5m/s Fluid Mechanics Research Group
Oil volume fraction0.25m/s; 0.5m/s Fluid Mechanics Research Group
Changing the weir height0.5m; 0.805m Fluid Mechanics Research Group
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
Further Modifications • Transient simulation • Models for emulsification, coagulation and bubble formation • Effect of solid particles Fluid Mechanics Research Group