Multiphase granular suspension flow during pumping in complex geometries - FLOWcomplex

复杂几何形状泵送过程中的多相颗粒悬浮液流 - FLOWcomplex

• 批准号: 387065607
• 负责人: Professor Dr.-Ing. Viktor Mechtcherine
• 金额: --
• 依托单位: Institut für Mechanik und Fluiddynamik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2017
• 资助国家: 德国
• 起止时间: 2016-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/387065607?language=en
• 关键词: Multiphase; granular; suspension; flow; during

In the project, the formation and the rheology of the lubrication layer during concrete pumping is investigated. Special attention is paid to the pulsating nature of the pumping process. For this purpose, the meso-scale two-phase flow field consisting of cement and coarser grains (sand and agglomerates) is modelled in an experiment and in numerical simulations. Details of the two individual phases (cement and coarse grains) are resolved separately in the two-phase flow especially near to pipe walls. Here, the focus is on particle migration and segregation during the permanently changing acceleration and deceleration periods of the two-phase flow. Flow rules for the two-phase flow in the lubrication layer are formulated with respect to the researched correlations between the individual meso-scale parameters of cement and coarser grains in the two-phase flow field.

本工程对泵送混凝土过程中润滑层的形成及流变性进行了研究。特别要注意的是泵送过程的脉动性质。为此，中尺度的两相流场组成的水泥和粗颗粒（砂和团聚体）的模拟实验和数值模拟。在两相流中，特别是在管壁附近，分别解决了两个单独的相（水泥和粗颗粒）的细节。在这里，重点是在两相流的永久变化的加速和减速期间的颗粒迁移和分离。润滑层中的两相流的流动规则制定相对于在两相流场中的水泥和粗颗粒的各个细观尺度参数之间的相关性的研究。