Collaborative Proposal: Rheology and Flow of Geometrically Cohesive Granular Materials

合作提案：几何粘性颗粒材料的流变学和流动

• 批准号: 1133722
• 负责人: Scott Franklin
• 金额: $ 19.47万
• 依托单位: Rochester Institute of Tech
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-01 至 2015-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1133722&HistoricalAwards=false
• 关键词: Collaborative; Proposal; Rheology; Flow; Geometrically

1133722 PI: Franklin1133722PI: TeitelThis project investigates a class of granular materials that are geometrically cohesive, e.g. a collective pile of particles that resists tensile forces. Examples of geometrically cohesive granular materials (GCGM) include long, thin rods (e.g. haystacks) and concave-shaped particles (semi-circles or U-shaped staples). These materials present a rich opportunity for basic research as well as new practical applications where structural rigidity, lightweight, and porosity are desired.Computer simulations and experiments for a variety of particle shapes - rods, semi-circles, and U-shaped staples - will be carried out to provide a better micro and macroscopic understanding of how particle shape affects fluidization and solidification in GCGM. Experiments previously carried out to characterize spherical granular media?basic rheology, tumbling, collapse, and flow ? will be repeated for the above complex-shaped particles. Numerical simulations using the Discrete Element Method will be used to probe the particle-level mechanism by which geometric cohesion occurs. New parallelization techniques involving graphics processing units (GPUs) will be developed for simulating thousands of particles. These experimental and computational studies will be used to explore the possible universality in geometric cohesion, the scaling of critical lengths, and the fundamental mechanism by which this cohesion occurs.This work will lead to increased understanding of granular materials consisting of complex shaped particles, a common occurrence in many industrial processes. The project also initiates collaboration between two institutions: a primarily undergraduate institute, Rochester Institute of Technology, and an R1 research university, University of Rochester. The collaboration will engage undergraduate and graduate students in a rich educational experience that emphasizes communication between experimentalists and computational researchers. Simulations and table-top experiments will allow undergraduates to engage in cutting edge research at both institutions.

1133722 PI：Franklin1133722PI：Teitelthis项目研究了一类粒状材料，这些材料具有凝聚力，例如一大堆抵抗拉伸力的颗粒。 几何粘性颗粒物材料（GCGM）的例子包括长杆（例如，干草堆）和凹形颗粒（半圆形或U形钉书钉）。这些材料为基础研究以及新的实用应用提供了丰富的机会，其中结构刚度，轻质和孔隙率为desired.computer模拟和实验各种粒子形状 - 杆，半圆形和U形的主食 - 将是为了提供更好的微型和粒子对粒子形状的影响和固体化的了解。以前进行的实验是为了表征球形粒状培养基吗？基本流变学，翻滚，崩溃和流动？将重复上述复杂形颗粒。使用离散元素方法的数值模拟将用于探测发生几何凝聚力的粒子级机制。将开发涉及图形处理单元（GPU）的新的并行化技术，以模拟数千个颗粒。这些实验和计算研究将用于探索几何凝聚力，临界长度的缩放以及发生这种凝聚力的基本机制的可能普遍性。这项工作将提高人们对由复杂形状颗粒组成的颗粒材料的了解，这是许多工业过程中常见的情况。该项目还启动了两个机构之间的合作：主要是本科研究所，罗切斯特理工学院和罗切斯特大学的R1研究工业。 该合作将使本科生和研究生参与丰富的教育经验，强调实验者与计算研究人员之间的沟通。 模拟和桌面实验将使本科生能够在两个机构进行尖端研究。