Axial Segregation in Granular Media

颗粒介质中的轴向偏析

• 批准号: 9501437
• 负责人: James Kakalios
• 金额: $ 8万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1997-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9501437&HistoricalAwards=false
• 关键词: Axial; Segregation; Granular; Media

ABSTRACT CTS-9501437 An experimental study will be undertaken on the physical mechanisms underlying axial segregation and mixing in binary mixtures of granular materials. A horizontal cylinder partly filled with granular material is rotated along its long axis. Particle size segregation and mixing in the axial direction occur as a function of the binary mixture and their dynamic angle of response, cylinder dimensions and rotational speed. The process is found to be determined by two competing mechanisms, the Fickian diffusion and a drift current. The diameter, mass and surface roughness of granular material (glass beads) will be systematically varied during experiments. The reversible segregation effect will be investigated like a phase transition, microscopic diffusion coefficients will be determined, and basic understanding of the generic axial segregation processes in granular materials and complex non-Newtonian fluid systems will be sought. The research will provide guidance to design industrial processes based on mixing and segregation of granular materials. ***

摘要CTS-9501437 将对粒状材料二元混合物中轴向偏析和混合的物理机制进行实验研究。 部分填充颗粒材料的水平圆柱体沿着其长轴旋转。 在轴向方向上的颗粒尺寸分离和混合作为二元混合物及其动态响应角、圆筒尺寸和旋转速度的函数而发生。 该过程被认为是由两个竞争机制，菲克扩散和漂移电流。 颗粒材料（玻璃珠）的直径、质量和表面粗糙度将在实验过程中系统地变化。 可逆的偏析效应将被调查像一个相变，微观扩散系数将被确定，并在粒状材料和复杂的非牛顿流体系统的通用轴向偏析过程的基本理解将寻求。 该研究将为设计基于颗粒材料混合和分离的工业过程提供指导。 ***