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1. Introduction
Flocculation is direct process of particle collisionthe process by which particles collide and agglomerate. Past research has shown that fluid shear plays gradients play an important role in causing the collision. Hence using CFD, the process in the flocculation tank is simulated. The ultimate result during flocculation. This process was simulated using Computational Fluid Dynamics (CFD). The main task of this research is to find the optimum strain rate in the flow that causes the shearing process which influencing the reactor to influence particle collision. The CFD tools that were used in the modeling process were Gambit and FLUENT were utilized to model one baffle turn. Gambit was used to create the geometry of the flocculator, set up boundary conditions and creating mesh while and to generate the mesh. FLUENT was used to plug in the data and initial conditions to obtain solutionset up the boundary conditions and to obtain the results.
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Methodology
The real life flocculation tank designed by Aguaclara involved a 180 deg turn over few dozens baffles. For validating result and modeling purpose, a simple 180 deg turn over two baffles was modeled. The first step was to set up the geometry of the of the simple flocculator. For future comparison with the experimental data, the design parameters for the pilot plant test flocculator was modified and used. The modeling approach that was utilized was creating geometry, mesh geometry, setting boundary condition, and finally solving using FLUENT.
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