Systematic studies of foam prevention and inhibition by identification of interfaces-non-existence domains and their realization by means of adaptive design of column random fillers and packs

它旨在通过对精细化学“功能”柱装置以及食品和饮料技术中的局部热流体动力学过程进行系统的实验和模拟研究，有助于预防和抑制不良泡沫。重点在于倾倒式元件和结构填料，它们主要在气体和液体之间有效地传输材料和热能，例如在萃取、吸收、蒸馏和精馏逆流塔中。当气体从柱底流向盖子时，液体以相反的方向流动，如涓滴膜，或沿功能元件表面的小溪。这通常会导致不必要的泡沫形成。化学泡沫抑制剂不能提供溶液，因为它们危及化学产品以及食品和饮料的纯度。这里的研究计划考虑纯机械泡沫形成在长度尺度上的倾倒型元件和结构填料。计划系统调查的重点在于通过被动物理措施预防和抑制不良泡沫，这些措施基于识别不存在气体包裹体和泡沫的区域。当净泡沫平衡为负且（广义）底波拉数非常高时，就会发生这种情况。提出的非存在域的识别假设毛细管力学效应在界面的稳定性中起着至关重要的作用，因此，在气体的包含中。研究从静态情况开始，并考虑基于仅存在于某些域中的界面的高斯-杨-拉普拉斯方程的解的零发展阶段的元素。这些包括毛细管主导的界面，具有高稳定性，使得气泡的形成非常困难或不可能。在提出的理论的背景下，流在细流膜和小溪被认为是扰动的静态平衡。通过检查界面的能级和稳定性，可以估计生成泡沫所需的新界面的趋势。这既适用于层流状态，也适用于湍流状态，文献对此提供了相应的判据。基于被动式泡沫管理的研究结果和方法，它旨在虚拟设计和实验测试新的功能柱固定装置。基于pareto的遗传算法在迭代开发周期中提供了必要的数学优化。

It intends to contribute to the prevention and inhibition of undesirable foams by means of systematic experimental and simulative studies on local thermos fluid dynamic processes in "functional" column installations of fine chemistry as well as food and beverage technology. The focus lies on dumped-type elements and structure packings which serve the effective transport of material and thermal energy between mostly a gas and a liquid, for example, in extraction, absorption, distillation and rectification counter-current columns. As the gas flows from the column floor to the lid, the liquid flows in the opposite direction as a trickle film, or a rivulet along the surface of the functional elements. This causes regularly a formation of unwanted foam. Chemical foam inhibitors provide no solution because they endanger the purity of chemical products as well as foodstuffs and beverages.The studies planned here consider purely mechanical foam formation on the length scale of dumped-type elements and structure packings. The focus of the planned systematic investigations lies on the prevention and inhibition of undesirable foams by passive physical measures based on the identification of domains, in which gas inclusions and, therefore, foams do not exist. This condition occurs when the net foam balance takes on negative and the (generalized) Deborah number very high values. The proposed identification of the non-existence domain postulates that capillary-mechanical effects play an essential role in the stability of interfaces and, thus, in the inclusion of gases. The investigations start with the static case and consider elements of the zero development stage based on solutions of the Gauss-young-Laplace equation for interfaces that exist only in certain domains. These include capillary-dominated interfaces with high stability that make the formation of bubbles very difficult or impossible. In the context of a proposed theory, currents in the trickle films and rivulets are considered as disturbances of the static equilibrium. By checking the energy level and the stability of the interface, the tendency to create new interfaces as required for the generation of foams can be estimated. This applies to both the laminar and the turbulent state, for which the literature provides corresponding criteria. Based on the findings and methods to be developed regarding passive foam management, it is intended to virtually design and experimentally test new functional column fixtures. Pareto-based genetic algorithms provide the necessary mathematical optimization in iterative development cycles.