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A numerical analysis of the effect of bubble-induced liquid flow on mass transfer in bubble plumes

机译:气泡引起的液体流动对气泡羽流传质影响的数值分析

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The utilization of microbubbles for higher mass transfer efficiency in compact reactors has become popular recently. Since the behavior of the microbubbles may differ widely from simple estimations with the effect of bubble-induced liquid flow, this effect on mass transfer in microbubble plumes has been analyzed numerically in the present work. A two-way coupling Eulerian-Lagrangian approach is used to simulate oxygen bubble plumes with initial bubble diameters from 100 um to 1 mm and a maximum local void fraction of less than 2% in compact rectangular tanks. The simulations illustrate that the effect of bubble-induced liquid velocity on the residence time of microbubbles increases with the decrease of initial bubble diameters, and also increases with the reduction of initial water depth.
机译:最近,在小型反应器中利用微泡提高传质效率。由于微气泡的行为可能与气泡引起的液体流动的影响与简单的估计相差很大,因此在本工作中已对这种对微气泡羽流中传质的影响进行了数值分析。在紧凑的矩形罐中,使用双向耦合欧拉-拉格朗日方法模拟初始气泡直径为100 um至1 mm且最大局部空隙率小于2%的氧气气泡羽流。模拟表明,气泡引起的液体速度对微气泡停留时间的影响随着初始气泡直径的减小而增加,并且随着初始水深的减小而增加。

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