Stereoscopic measurements of liquid film flims on textured inclined plates

在这个更新的建议的影响，微观和宏观结构上的液体膜流的流体动力学将进行调查。这种液膜流动应用于广泛的能源和化学工程过程中。例如蒸馏过程，其中液体在具有逆流气相的微观和宏观结构化表面上向下流动。与光滑液膜相比，波状界面的液体侧质量传递增强。微结构表面的应用由于垂直于主流分量的速度分量的诱导而引起进一步的传质强化。这促进了靠近液体区域的壁的混合。这些相互作用发生在工业上使用的规整填料上，通过在填料的不同局部倾斜角度的宏观结构上的液体流动，导致复杂的流体动力学，这对于塔中使用的分离内件的成功至关重要。因此，将使用第一个供资期开发的测量技术进行实验性调查。在第一步中，具有平面宏观结构的开放填料通道应该是流体动力学特征，并且在进一步的步骤中，微观结构对宏观结构对液体流动的影响应该被更详细地检查。在附加的工作包中，这些研究也应该对封闭填料通道进行，以获得关于微观和宏观结构对液膜流动的流体动力学影响的基本知识。

In this renewal proposal the influence of micro and macro structures on the fluid dynamics of liquid film flow will be investigated. Such liquid film flow is applied in a wide range of energy- and chemical engineering processes. e.g. distillation processes, where the liquid flows downwards on micro and macro structured surfaces with a countercurrent gas phase.Compared to a smooth liquid film the liquid side mass transport of a wavy interface is enhanced. The application of micro structured surfaces causes further mass transfer intensification due to the induction of velocity components perpendicular to the main flow component. This promotes the mixing of the wall near region of the liquid. These interactions occur on industrial used structured packings by the liquid flow over the macro structures in different local inclination angels of the packing, resulting in a complex fluid dynamics that are crucial for the success of the separation internals used in a column.This relationship should be investigated systematically in detail within the framework of this renewal proposal. Therefore experimental investigations will be carried out using the measurement technique developed in the first funding period. In a first step, the open packing channel with planar macro structures should be fluid dynamically characterized, and in a further step the influence of micro structures on the macro structures to the liquid flow should be examined in more detail. In additional working packages, these investigations should also be carried out for the closed packing channel to get fundamental knowledge about the fluid dynamic influence of micro and macro structures to liquid film flow.