Solids volume fraction of size-disperse dense granular flows

尺寸分散致密颗粒流的固体体积分数

• 批准号: 2905654
• 金额: --
• 依托单位: University of Manchester
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2905654
• 关键词: Solids; volume; fraction; size; disperse

Solids volume fraction is perhaps the most fundamental state variable describing granular materials. The solids volume fraction is nearly constant in dense granular flows, but nonetheless plays a crucial role in setting their rheology, with the viscosity diverging as the volume fraction reaches a critical value. For grains of a single size this critical volume fraction is a constant, but in mixtures of more than one size of grain, it varies with the particle size distribution. The aim of this project is to develop continuum models that describe the numerous interactions and dependencies between particle size distribution, volume fraction, rheology and segregation rate, many of which are currently unexplored. A combination of laboratory experiments and discrete element simulations will be used to validate new continuum models for granular segregation and flow, in which the solids volume fraction evolves as part of the solution. The project brings together the research areas of particle technology, complex fluids and rheology, and continuum mechanics.

固体体积分数可能是描述颗粒材料的最基本状态变量。固体体积分数在致密的颗粒流中几乎是恒定的，但是尽管体积分数达到临界值，但在设置其流变方面起着至关重要的作用，粘度差异。对于单个尺寸的谷物，此临界体积分数是一个常数，但是在多种谷物的混合物中，它随粒径分布而变化。该项目的目的是开发连续模型，以描述粒度分布，体积分数，流变学和隔离率之间的众多相互作用和依赖性，其中许多目前尚未探索。实验室实验和离散元件模拟的组合将用于验证新的连续模型用于颗粒分离和流动，其中固体体积分数作为溶液的一部分而演变。该项目汇集了粒子技术，复杂流体和流变学和连续力学的研究领域。