Experimental and theoretical investigation of fluid dynamics and separation behavior of moving columns

浮式平台或大型船舶上的气液接触单元中的流体混合物的分离由于涌浪条件而面临严峻的技术挑战。柱内两相之间的界面接触面积是决定柱高的最重要参数。在规整填料塔中，总几何填料表面积的利用以及均匀的相分布对于相之间的有效接触是至关重要的。然而，柱暴露于相当大的静态和动态倾斜，这会导致由于重力和惯性力的相分布不均匀，并因此显着地影响分离过程。为此，一个可行的建模方法的基础上的流体动力学类比的概念将开发能够预测已知的润湿条件下的分离性能。这些知识将通过系统的实验研究来实现，实验研究涉及旋转和平移运动对流体动力学的影响。填料截面内的特征流动结构将被识别和测量动态与一种新的薄膜传感器在高时间分辨率。因此，推导出的描述两相流的流体动力学的相关性将被纳入为描述分离性能而开发的动态模型方法中。并以三甘醇空气蒸馏过程为例进行说明。

The separation of fluid mixtures in gas-liquid contact units on floating platforms or big ships faces severe technical challenges due to the swell conditions. The interfacial contact area between two phases inside the column is the most important parameter that determines the column height. In structured packing columns, the utilization of the overall geometric packing surface area as well as homogeneous phase distribution are crucial for an efficient contact between the phases. However, columns are exposed to considerable static and dynamics tilts, which cause phase maldistribution owing to gravitational and inertial forces and, as a consequence, affect the separation processes remarkably.The project aims at describing the separation performance of moving columns by considering their evolving fluid dynamics. To this end, a feasible modelling approach based on the hydrodynamic analogy concept will be developed capable of predicting the separation performance for known wetting conditions. This knowledge will be achieved through a systematic experimental study concerning the influence of rotational and translational motions on the fluid dynamics. Characteristic flow structures within the packing cross-section will be identified and measured dynamically with a novel film sensor at high temporal resolution. Consequently derived correlations describing the fluid dynamics of the two-phase flow will be incorporated in the dynamic model approach to be developed for the description of the separation performance. The process of air dehumidification with triethylene glycol will be applied as an example.