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Figure 2 shows the meshing parameters that were used. The boundary layers was first establish at all the wall surfaces. The boundary layer was set up such that the solution obtain in gambit would provide result of y+ of less than 5. After that, the mesh edges were set up such that they will provide higher mesh resolution near the turn and lower resolution far from the turn. With the initial meshing conditions set up, all the faces were then meshed.
Figure 3: Mesh of the Model (Click on figure for original size)
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Some of the important results are the velocity vectors, contour of pressure coefficient, contours of pressure coefficient, contours of strain rate and contours of turbulence dissipation rate.
Figure 5: Velocity Vectors (Click on figure for original size)
Velocity vector plot shows the velocity of the fluids throughout the flocculator. As can be seen, there is a region of high velocity at the outer turn and recirculation at the inner turn. At the bottom of the flocculator, there is region of stagnant fluid.
Figure 6: Contours of Stream Function (Click on figure for original size)
Contours of stream function tell us how the fluid travel in the flocculator. As can be seen from figure 6, there is enclosed streamline at the inner turn. The enclosed streamlines means there are recirculating fluid which are trapped in the region.
Figure 7: Contours of Pressure Coefficient
Figure 7 shows most of the pressure coefficient drop occurs around the bend. There is a pressure coefficient drop of about 3.7 across the bend. (Talk about the experimental result. Literature review data)
Figure 8: Contours of Strain Rate
Figure 9: Contours of Turbulent Disssipation Rate