Multidimensional fractionation of finely dispersed particles using cross-flow filtration with superimposed electric field

使用叠加电场错流过滤对细分散颗粒进行多维分级

• 批准号: 382065508
• 负责人: Professor Dr.-Ing. Sergiy Antonyuk
• 金额: --
• 依托单位: Lehrstuhl für Mechanische Verfahrenstechnik (MVT)
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/382065508?language=en
• 关键词: Multidimensional; fractionation; finely; dispersed; particles

The separation of particle fractions with highly specific physical properties from suspensions has a great importance in numerous engineering processes. In many applications, in which finely dispersed multicomponent mixtures of particles with sizes <10 μm and different properties are to be separated in industrially relevant quantities, the fractionation due to only one separation characteristic is no longer sufficient. Within the framework of the DFG Priority Program SPP 2045 " Highly specific and multidimensional fractionation of fine particle systems with technical relevance", a novel cross-flow filtration process with superimposed electrical field was developed in the first funding period. This process represents a method for the highly specific separation of suspensions with the micro and submicron particles (< 10 microns). The fractionation is performed with the help of hydrodynamic and electrophoretic forces. The lift forces and electrophoretic forces cause a pre-classification of the particles in the flow channel in front of the filter area. After that the actual fractionation takes place on the open-pore filter medium by the drag forces acting due to the filtrate rate. The aim of the research project is the further development and the upscaling of the new method, which was studied in the first funding period. The focus of the investigations is on the influence of the process parameters (flow velocity, pressure difference and electric field strength) and the material system (particle shape, composition, additives for potential change) on the hydrodynamic and the electrophoretic equivalent diameter of the fractionation. By means of experimental investigations and supporting simulations of the particle movement in the flow, the particle separation during cross-flow filtration is described in terms of size, shape and electrophoretic mobility and thus the optimal parameter ranges are determined. To obtain additional parameters of the separation process, a multiscale modeling approach is used. On the microscale, the simulations using CFD-DEM coupling are performed, which provide information on the local particle dynamics and hydrodynamics and provide the parameters for the simulation of the overall process on the macro scale. The upscaling of the process has to be performed to provide technically relevant quantities of highly specific ultrafine particle suspensions.

从悬浮液中分离具有高度特定物理性质的颗粒级分在许多工程过程中具有非常重要的意义。在许多应用中，需要以工业相关量分离粒度<10 μm且性质不同的颗粒的精细分散的多组分混合物，仅由于一种分离特性而进行的分级是不够的。在DFG优先计划SPP 2045“具有技术相关性的细颗粒系统的高度特异性和多维分级”的框架内，在第一个资助期内开发了一种具有叠加电场的新型错流过滤工艺。该工艺代表了一种用于高度特异性分离具有微米和亚微米颗粒（< 10微米）的悬浮液的方法。在流体动力学和电泳力的帮助下进行分馏。升力和电泳力导致过滤区域前面的流动通道中的颗粒的预分类。在此之后，通过由于过滤速率而作用的拖曳力在开孔过滤介质上发生实际分馏。该研究项目的目的是进一步发展和扩大在第一个供资期研究的新方法。调查的重点是对流体动力学和电泳等效直径的分馏的过程参数（流速，压差和电场强度）和材料系统（颗粒形状，组合物，添加剂的电位变化）的影响。通过实验研究和支持模拟的颗粒在流中的运动，在交叉流过滤过程中的颗粒分离描述的大小，形状和电泳迁移率，从而确定最佳的参数范围。为了获得分离过程的附加参数，使用多尺度建模方法。在微观尺度上，采用CFD-DEM耦合进行模拟，提供了局部颗粒动力学和流体动力学的信息，并为宏观尺度上整个过程的模拟提供了参数。必须进行该方法的放大，以提供技术上相关量的高度特异性的超细颗粒悬浮液。