Coalescence efficiency in binary systems

该项目的重点是关于双液滴-液滴合并的基础研究。这两个小组都结合了他们对液滴和液滴群行为的经验，以改进和量化与液滴合并相关的基本现象。第一个项目的结果证实，相互合作将在处理液滴合并这一复杂现象方面带来协同效应。在建立了标准化程序(EXP2至4)和试验台(EXP 1)之后，开始了成功的数据采集。得到的结果不能用现有的聚结核进行模拟，现有的模型将在这方面进行改进。将特别注意流体动力学(接触时间、相对速度等)。化学成分(pH值、盐分、离子强度等)条件，以跨越广泛的数据领域，以获得预测模型。在这方面，考虑了额外的庚烷/水测试体系，其粘度几乎与甲苯/水相同，但界面张力较高，促进了聚结。CFD研究还应该有助于可视化实验上难以探索的区域中的现象，特别是在初始结合时膜破裂和流出的现象。新核的验证将由两个小组在搅拌容器或萃取柱中完成。

The project has its focus on fundamental research regarding binary droplet-droplet coalescence. Both groups combine their experience of droplet and droplet swarm behavior in order to improve and quantify the basic phenomena related to droplet coalescence. The results from the first project confirmed, that the mutual cooperation will bring synergies in handling the complex phenomenon of coalescence of droplets. After establishing standardized procedures (EXP2 to 4) and test rigs (EXP 1) a successful data acquisition started. The obtained results cannot be simulation with existing coalescence kernels, and existing models will be improved in that respect. Special attention will be drawn to hydrodynamic (contact time, relative velocity, etc.) and chemical (pH-value, salts, ionic strength, etc.) conditions, in order to span a wide data field to gain a predictive model. In that respect an additional test system heptane/water is considered, with almost same viscosity as toluene/water but higher interfacial tension promoting coalescence. CFD studies should additionally help to visualize phenomena in experimentally difficult to explore domains, especially with film rupture and outflow at initial coalescence. The validation of the new kernels will be done by the two groups in either stirred vessels or extraction columns.