Numerical and Experimental Investigation of Liquid-Liquid Two-Phase Flow in Stirred Tanks
Numerical and Experimental Investigation of Liquid-Liquid Two-Phase Flow in Stirred Tanks
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DOI：
10.1021/ie049001g
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发表时间：
2005-06
影响因子：
4.2
通讯作者：
Feng Wang;Z. Mao
中科院分区：
文献类型：
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作者：
Feng Wang;Z. Mao
提出了有关分散阶段在拉什顿叶轮搅拌搅拌罐中持有的实验数据。使用样品戒断方法进行实验测量，以在各种操作条件下在实验室尺寸搅拌罐中获得局部分散相的固定。还通过求解由两流体模型配方的两个相的两个相的雷诺平均的navier-stokes方程，在数值上模拟了搅拌罐中的三维湍流液态流动。使用众所周知的K- Epsilon湍流模型的简单两相扩展来制定湍流效果，该延伸是通过在连续相的湍流动能能量传输方程中添加从分散相的存在产生的额外源项。采用了修改的“内部”迭代程序来对旋转叶轮与壁式挡板的相互作用进行建模。将模型预测的平均速度，连续相的湍流特性以及分散阶段的持有曲线与已发布的实验数据和目前的测量值进行比较，以验证计算程序，并发现良好的一致性可达到相当高的总体分散相阶段持有案例（30 vol％）。
The experimental data on the holdup of the dispersed phase in a Rushton impeller agitated stirred tank are presented. Experimental measurement is performed utilizing the sample withdrawal method to obtain the local dispersed-phase holdup in a laboratory-scale stirred tank under a variety of operating conditions. Three-dimensional turbulent two-phase liquid-liquid flow in the stirred tank is also numerically simulated by solving the Reynolds-averaged Navier-Stokes equations of two phases formulated by the two-fluid model. The turbulence effect is formulated using a simple two-phase extension of the well-known k-epsilon turbulence model by adding an extra source term generated from the presence of the dispersed phase in the turbulent kinetic energy transport equation of the continuous phase. A modified "inner-outer" iterative procedure is employed to model the interaction of the rotating impeller with the wall baffles. The model-predicted mean velocity, turbulence characteristics of the continuous phase, and holdup profiles of the dispersed phase are compared against the published experimental data and the present measurements to validate the computational procedure, and good agreement is found up to a rather high overall dispersed-phase holdup case (30 vol %).