Experiments and fully transient coupled CFD-PBM 3D flow simulations of disperse liquid-liquid flow in a baffled stirred tank
Experiments and fully transient coupled CFD-PBM 3D flow simulations of disperse liquid-liquid flow in a baffled stirred tank
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DOI：
10.1016/j.ces.2022.117518
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发表时间：
2022-02
影响因子：
4.7
通讯作者：
Kevin Rave;Mario Hermes;D. Wirz;Markus Hundshagen;A. Friebel;E. Harbou;H. Bart;R. Skoda
中科院分区：
文献类型：
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作者：
Kevin Rave;Mario Hermes;D. Wirz;Markus Hundshagen;A. Friebel;E. Harbou;H. Bart;R. Skoda
采用实验和三维仿真的方法研究了不同叶轮转速和体积分数下拉什顿涡轮搅拌隔板槽内液-液分散多相流动。采用内联阴影探针对液滴尺寸分布进行了实验测量，并与采用欧拉多流体框架、非均匀多尺寸群方法和统计湍流模型的完全瞬态耦合CFD-PBM模拟进行了比较。通过尺寸类和速度群数的变化、网格分辨率和模拟域范围对模拟模型进行了评价。拟合破碎核和聚结核的模型参数，以匹配在选定的工作点上测量到的液滴尺寸分布。随后对不同操作点的应用表明，实验液滴尺寸趋势被捕获，尽管除了拟合点之外，数据偏差增加。通过对湍流混合、破裂和聚并时间尺度的评估，分析了所得液滴的尺寸分布。
Liquid-liquid disperse multiphase flow in a baffled tank stirred by a Rushton turbine is investigated by experiments and 3D simulations for different impeller speeds and volume fractions. Droplet size distributions are experimentally measured with an inline shadowgraphic probe and compared with fully transient coupled CFD-PBM simulations using the Eulerian multi-fluid framework, the inhomogeneous Multiple Size Group approach and a statistical turbulence model. The simulation model is assessed by a variation of size class and velocity group numbers, grid resolution and simulation domain extent. The model parameters for the breakup and coalescence kernels are fitted to match the measured droplet size distribution at a selected operation point. A subsequent application to different operation points shows that experimental droplet size trends are captured, albeit aside from the fitting point, deviations to data increase. The resulting droplet size distribution is analyzed by an assessment of the turbulent mixing, breakup and coalescence time scales.