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One of the ways to determine the best geometry is by evaluating the uniformity of energy dissipation rate. Since energy dissipation rate is the core parameter that influence the particle collision, flocculation tank with uniform energy dissipation rate will perform better. We investigated different geometric space to come out with a flocculation tank with uniform energy dissipation rate. The optimization method started with an initial condition. We then changed the geometry parameters such as clearance height, baffle spacing and flocculation tank height. If change in geometry resulted in a more uniform energy dissipation rate than the initial geometry, the new geometry is called incumbent. Following this process, investigate the geometry in all possible geometric space and the final incumbent will be chosen as the optimal solution.
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Figure 1: Turbulent Dissipation Rate (fh = 2b bs = 0.1 ch = 1b)
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From first semester, we concluded that clearance height should go no smaller than the baffle spacing. We would also like to start our investigation of the geometric space by having the most overlapping energy dissipation region. Using the two constraints, we come up with the initial flocculation tank height of 2b. Figure 1 shows the contour of turbulent dissipation rate with such geometry. We see that the energy dissipation rate is fairly uniform. This will be the new incumbent. We see that there is large blue region in the inner turn. By reducing the baffle spacing we hope to reduce the non-active region.
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Figure 2: Turbulent Dissipation Rate (fh = 0.2 bs = 0.07 ch = 0.1)
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