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Experimental and numerical investigation on mixing and axial dispersion in Taylor-Couette flow patterns

机译:Taylor-Couette流型中混合和轴向弥散的实验和数值研究

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摘要

Taylor-Couette flows between two concentric cylinders have great potential applications in chemical engineering. They are particularly convenient for two-phase small scale devices enabling solvent extraction operations. An experimental device was designed with this idea in mind. It consists of two concentric cylinders with the inner one rotating and the outer one fixed. Moreover, a pressure driven axial flow can be superimposed. Taylor-Couette flow is known to evolve towards turbulence through a sequence of successive hydrodynamic instabilities. Mixing characterized by an axial dispersion coefficient is extremely sensitive to these flow bifurcations, which may lead to flawed modelling of the coupling between flow and mass transfer. This particular point has been studied using experimental and numerical approaches. Direct numerical simulations (DNS) of the flow have been carried out. The effective diffusion coefficient was estimated using particles tracking in the different Taylor-Couette regimes. Simulation results have been compared with literature data and also with our own experimental results. The experimental study first consists in visualizing the vortices with a small amount of particles (Kalliroscope) added to the fluid. Tracer residence time distribution (RTD) is used to determine dispersion coefficients. Both numerical and experimental results show a significant effect of the flow structure on the axial dispersion.
机译:两个同心圆柱之间的Taylor-Couette流动在化学工程中具有巨大的潜在应用。它们对于两相小规模设备特别方便,可以进行溶剂萃取操作。在设计实验设备时就牢记了这一想法。它由两个同心圆柱体组成,内部一个旋转,外部一个固定。此外,可以叠加压力驱动的轴向流。众所周知,泰勒-库埃特流通过一系列连续的流体动力学不稳定性向湍流发展。以轴向弥散系数为特征的混合对这些流动分叉极为敏感,这可能导致流动与传质之间的耦合建模错误。已经使用实验和数值方法研究了这一特定点。已对流程进行了直接数值模拟(DNS)。使用在不同的Taylor-Couette方案中跟踪的粒子来估算有效扩散系数。仿真结果已与文献数据以及我们自己的实验结果进行了比较。实验研究首先包括可视化的涡流以及添加到流体中的少量颗粒(万花筒)。示踪剂停留时间分布(RTD)用于确定色散系数。数值和实验结果均显示了流动结构对轴向弥散的显着影响。

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