EXPERIMENTAL AND NUMERICAL SIMULATION OF THREE-PHASE FLOW IN AN AERATION TANK
EXPERIMENTAL AND NUMERICAL SIMULATION OF THREE-PHASE FLOW IN AN AERATION TANK
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发表时间：
2003
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通讯作者：
Chengwen;ZhouXiao-de;SongCe;Mintao;MuraiYuichi;YamamotoFujio
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作者：
Chengwen;ZhouXiao-de;SongCe;Mintao;MuraiYuichi;YamamotoFujio
曝气池中气泡、污水和活性污泥之间的相互作用使曝气在活性污泥的处理中起着重要作用。曝气性能直接关系到污水处理的效率。因此，本文建立了以相相互作用项为重点的三维双流体模型。该模型作为两相流模型的扩展，涉及了三相的运动规律，并与实验研究进行了比较。采用有限体积法对气液两相流和气液固三相流进行了数值模拟。为了探讨曝气池内气相、液相和固相运动对污水处理的影响，采用了三种边界条件和初始条件。流动结构的模拟结果与实验数据在质量上吻合较好。并根据模拟结果探讨了最佳曝气池设计的理论依据。
Aeration plays an important role in the treatment of activated sludge due to the interactions among bubbles, sewage and activated sludge in an aeration tank. The aeration performance is directly concerned with the efficiency of sewage disposal. So the three-dimensional two-fluid model was established with emphasis on the phase interaction terms in this paper. This model, as an extension of the two-phase flow model, involved the motion laws of three-phases, and was compared with experimental studies. The finite volume method was used in the numerical simulation of gas-liquid two-phase flow and gas-liquid-solid three-phase flow. In order to discuss the influence of gas-phase, liquid-phase and solid-phase motions in an aeration tank on the sewage disposal, three kinds of boundary and initial conditions were adopted. The simulated results of the flow structure show qualitatively good agreement with the experimental data. And the theoretical basis for designing the best aeration tank was discussed according to the simulated results.