| Summary: | 碩士 === 淡江大學 === 化學工程與材料工程學系碩士班 === 97 === This study uses the software FLUENT(used for computational fluid dynamics) to simulate reaction clarifier blanket inside Bansin water treatment plant. We first establish the geometric structure and mesh of the clarifier blanket, then provide feed velocity, concentration, impeller rotation, and operation conditions for the sludge blanket. Then we use the Eulerian multiphased turbulent model to calculate and analyze the flow field inside the water treatment plant. Next we explore flow field alterations and compare it with the clarifier researches in the past. 1.the compare in different feed concentration 2.the compare in different impeller rotational velocity 3.the compare in sludge blanket height, 4 simulate particle’s path by DPM 5.the compare in clarifier blanket structure 6.simulate the flow field in the clarifier by the viscosity function defined myself. Using the above calculations and analysis, we hope to obtain better water quality.
This study shows that turbulent model isn’t easy agitate than laminar model. High impeller rotational velocity causes the sludge blanket easily to agitate. With high concentration feed, the sludge blanket to agitate fast.; The height blanket the sludge blanket to agitate fast.; Regarding changes in the geometric structure, we find the longer the solid particles stay in the reaction well. A parameter called particle dissipation energy control the viscosity calculation that the defined viscosity function.
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