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

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

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Fluid Mechanics Research Group A typical separator

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

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Fluid Mechanics Research Group CFD Model

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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

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Fluid Mechanics Research Group Mesh models

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

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Fluid Mechanics Research Group Variation of oil volume fraction at outlet2

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

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

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

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

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Fluid Mechanics Research Group Streamlines

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Fluid Mechanics Research Group Parametric comparisons

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

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

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Fluid Mechanics Research Group Oil volume fraction 0.25m/s; 0.5m/s

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Fluid Mechanics Research Group Changing the weir height 0.5m; 0.805m

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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

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

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Lecture 17 - Eulerian-Granular Model Applied Computational Fluid Dynamics Instructor: André Bakker © André Bakker (2002) © Fluent Inc. (2002)

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