Erzeugung definierter Suspensionstropfen in einer laminaren Dehnströmung

在以前项目的基础上，应研究收缩通道几何形状内存在颗粒时非混相流体的崩解行为。技术目标是在系统的高流速下形成包含相同数量颗粒的相同大小的液滴。在0.1-dp/dt&lt；0.5的范围内，最小粒径大于0.3 mm。出于这个原因，同样在高颗粒负载下，只有很少的颗粒被液滴捕获。在滴滴和层流射流破碎区域内都要检查液滴的形成。流体的粘度比和绝对粘度是不同的。但是，只考虑低回流条件Re&lt；10。通过改变颗粒对两种液体相的润湿性质(接触角)，颗粒应该迁移到液滴表面，以起到相互最高活性的催化剂颗粒的作用。通过对颗粒表面进行化学修饰，可以改变颗粒的润湿性能。通过对连续流体的环状去除，可以获得体积分散相含量较高的分散体≥0.4.然后，这些分散体将在琼脂教授的TCB小组的子项目C1中的毛细管反应器中根据它们的反应动力学特性进行使用和表征。

Based on the previous projects, the disintegration behavior of non-miscible fluids in presence of particles within a contracting channel geometry shall be examined. Technical goal is the formation of equal sized droplets containing equal numbers of particles at high flow rates of the system. The particle to drop size ratio is proposed within the range of 0.1 < dP/dT < 0.5 with smallest particles larger than 0.3 mm. For that reason also at high particle loads only few particles are entrapped with the droplets. The drop formation is to be examined within the dripping as well as within the laminar jet breakup region. The viscosity ratio of the fluid as well as the absolute viscosity is to be varied. However only low Re-Flow conditions Re < 10 will be considered. By changing the wetting properties (contact angles) of the particles to both of the fluid phases the particles should migrate to the drop surfaces there to act as catalyst particles with mutual highest activity. The wetting properties are to be changed by chemical modification of the particle surfaces. By annular removal of the continuous fluid, dispersions with high volumetric disperse phase content ≥ 0.4 should be achieved. These dispersions will then be used and characterized according to their reaction kinetic properties in capillary reactors within the Sub-Project C1 at the TCB group of Prof. Agar.