Erzeugung definierter Suspensionstropfen in einer laminaren Dehnströmung

基于以前的项目，应检查收缩通道几何形状内存在颗粒时不混溶流体的崩解行为。技术目标是在系统的高流速下形成包含相等数量的颗粒的相等尺寸的液滴。颗粒与液滴尺寸比建议在0.1 < dP/dT < 0.5的范围内，最小颗粒大于0.3 mm。因此，在高颗粒负荷下，液滴仅捕获少量颗粒。液滴形成将在液滴内以及层流射流破碎区域内进行检查。流体的粘度比以及绝对粘度是变化的。 然而，仅考虑低回流条件Re < 10。通过改变颗粒对两种流体相的润湿性质（接触角），颗粒应迁移到液滴表面，在那里充当具有相互最高活性的催化剂颗粒。润湿性能将通过颗粒表面的化学改性来改变。通过连续流体的环形移除，应实现具有≥ 0.4的高体积分散相含量的分散体。这些分散体将在琼脂教授的TCB小组的子项目C1内的毛细管反应器中使用并根据其反应动力学特性进行表征。

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.