Shear Driven Flow of Granular and Soft-Matter Materials

颗粒和软物质材料的剪切驱动流

• 批准号: 1809318
• 负责人: Stephen Teitel
• 金额: $ 33.55万
• 依托单位: University of Rochester
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2019
• 资助国家: 美国
• 起止时间: 2019-09-01 至 2022-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1809318&HistoricalAwards=false
• 关键词: Shear; Driven; Flow; Granular; Soft

NONTECHNICAL SUMMARYThis award supports theoretical and computational research and education in granular and soft-matter materials. Granular and soft-matter materials are ubiquitous in nature and every day life. One such class of materials is dry granular materials, which includes powders, seeds, grains, sand, and gravel. Another class are classified among soft-matter materials, and generally consist of particles suspended in fluids. These include: emulsions consisting of droplets of one fluid suspended in a second fluid, such as mayonnaise, vinaigrettes, and homogenized milk; foams consisting of bubbles of gas suspended in a fluid, such as shaving cream, soap bubbles, and whipped cream; and suspensions consisting of solid particles suspended in a fluid, such as ketchup, mustard, and paint. These materials are important for a wide variety of technologies and industrial processes, from the processing of pharmaceuticals and foods, to transportation of seeds and grains, to materials fabrication. At the simplest level of abstraction, one may think of these materials as consisting of large particles, for which thermal fluctuations are negligible, that interact only when they come into contact with each other, in which case they repel. Yet despite this seeming simplicity, surprisingly complex behavior may emerge, in particular a transition from a flowing liquid-like state to a rigid but disordered solid state, as either the particle packing density or applied stress is varied. This is known as the "jamming transition." In this project, computer simulations will be used to investigate the nature of this jamming transition, along with more general behavior of such materials that emerges under shear driven flow where adjacent granular layers move parallel to each other with different relative speed. Different mechanisms for energy dissipation, and the effects of different particle shapes will be investigated.This project will also promote the teaching, training, and engagement in science and research, of a wide range of students across multiple institutions. Undergraduate students will gain experience in both scientific research and scientific communication by presenting work at local and national research conferences. Graduate students will be trained in the methods of modern theory and high-performance computing and experience research with direct interaction between theory and experiment. In this way, they become prepared for future high-tech careers in academia or industry. The infrastructure for research and education will be enhanced by the formation of a network of collaborations with domestic and international colleagues engaged in complementary experimental and computational research in this area. TECHNICAL SUMMARYThis award supports theoretical and computational research and education in granular and soft-matter materials. Computer simulations will be carried out to study different aspects of the behavior of granular and soft-matter materials near the jamming transition that marks the abrupt change from a flowing liquid-like state to a rigid but disordered solid state, as the particle packing is increased. Materials of interest include dry granular matter, dense granular particles in a slurry, emulsions, foams, non-Brownian suspensions, and colloids. Specific problems will be investigated, with the objective of increasing understanding about the flowing liquid and disordered solid phases of such materials, and the transitions between them. These include: (i) the physical mechanisms behind shear banding of shear flowing materials in homogeneous environments; (ii) the relation between discontinuous shear thickening, the rapid jump in shear stress upon increasing the strain rate, and microscopic inter-particle elastic friction; (iii) the differences between isotropic compressional jamming and shear jamming, in systems of frictional particles; (iv) the effect of orientational ordering and particle tumbling on the shear flow of materials consisting of aspherical particles; (v) the criticality of the shear-driven jamming transition for aspherical particles; (vi) the effect of particle surface concavity on shearing rheology. Collaborations with experimental groups working in these areas will help inform and guide theoretical progress.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该奖项支持颗粒和软物质材料的理论和计算研究和教育。颗粒和软物质材料在自然界和日常生活中无处不在。 一类这样的材料是干燥的粒状材料，其包括粉末、种子、谷物、沙子和砾石。 另一类被归类为软物质材料，通常由悬浮在流体中的颗粒组成。其中包括：由悬浮在第二种流体中的一种流体的液滴组成的乳液，如蛋黄酱、醋汁和均质牛奶;由悬浮在流体中的气泡组成的泡沫，如剃须膏、肥皂泡和搅打奶油;以及由悬浮在流体中的固体颗粒组成的悬浮液，如番茄酱、芥末和油漆。 这些材料对于各种技术和工业过程都很重要，从药品和食品的加工到种子和谷物的运输，再到材料制造。 在最简单的抽象层次上，人们可以认为这些材料是由大颗粒组成的，对它们来说，热波动可以忽略不计，只有当它们彼此接触时才会相互作用，在这种情况下，它们相互排斥。 然而，尽管这种看似简单，但可能出现令人惊讶的复杂行为，特别是从流动的液体状状态到刚性但无序的固态的转变，因为颗粒堆积密度或施加的应力变化。 这就是所谓的"干扰过渡"。"在这个项目中，计算机模拟将用于研究这种堵塞过渡的性质，沿着这种材料在剪切驱动流下出现的更一般的行为，其中相邻的颗粒层以不同的相对速度彼此平行移动。 本项目将研究不同的能量耗散机制和不同颗粒形状的影响。该项目还将促进多个机构的广泛学生的教学，培训和参与科学和研究。 本科生将通过在地方和国家研究会议上展示工作来获得科学研究和科学交流方面的经验。 研究生将接受现代理论、高性能计算和经验研究方法的培训，理论与实验之间直接互动。通过这种方式，他们为未来在学术界或工业界的高科技职业做好了准备。 研究和教育的基础设施将通过与国内和国际同事建立合作网络来加强，这些同事从事该领域的补充实验和计算研究。 该奖项支持颗粒和软物质材料的理论和计算研究和教育。将进行计算机模拟，以研究颗粒和软物质材料在堵塞过渡附近的行为的不同方面，该过渡标志着从流动的液体状状态到刚性但无序的固体状态的突然变化，因为颗粒堆积增加。 感兴趣的材料包括干颗粒物质、浆料中的致密颗粒、乳液、泡沫、非布朗悬浮液和胶体。 具体的问题将进行调查，与增加有关流动的液体和无序的固体相的这种材料，以及它们之间的过渡的理解的目的。其中包括：（1）均匀环境中剪切流动物质剪切带形成的物理机制，（2）剪切增稠的不连续性、应变率增加时剪切应力的快速突变与微观颗粒间弹性摩擦的关系，（3）摩擦颗粒系统中各向同性压缩堵塞与剪切堵塞的区别，（4）剪切增稠与剪切增稠的关系，（5）剪切增稠与剪切增稠的关系，（6）剪切增稠与剪切增稠的关系，（7）剪切增稠与剪切增稠的关系，（8）剪切增稠与剪切增稠的关系，（9）剪切增稠与剪切增稠的关系，（10）剪切增稠与剪切增稠的关系，（10）剪切增稠与剪切增稠的关系，（11）剪切增稠与剪切增稠的关系，（12）剪切增稠与剪切增稠的关系，（11）剪切增稠与剪切增稠的关系，（12）剪切增稠与剪切增稠的关系，（11）剪切增稠与剪切增稠的关系，（12）剪切增稠与剪切增稠（iv）取向有序和颗粒翻滚对由非球面颗粒组成的材料的剪切流动的影响;（v）非球面颗粒的剪切驱动的堵塞转变的临界性;（vi）颗粒表面粗糙度对剪切流变学的影响。 该奖项反映了NSF的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Dynamic length scales in athermal, shear-driven jamming of frictionless disks in two dimensions

二维无摩擦盘非热、剪切驱动干扰的动态长度尺度

• DOI: 10.1103/physreve.102.042906
• 发表时间: 2020
• 期刊: Physical Review E
• 影响因子: 2.4
• 作者: Olsson, Peter;Teitel, S.
• 通讯作者: Teitel, S.

Synchronized oscillations in swarms of nematode Turbatrix aceti

醋酸涡轮线虫群的同步振荡

• DOI: 10.1039/d1sm01572a
• 发表时间: 2022
• 期刊: Soft Matter
• 影响因子: 3.4
• 作者: Peshkov, Anton;McGaffigan, Sonia;Quillen, Alice C.
• 通讯作者: Quillen, Alice C.

Critical scaling of compression-driven jamming of athermal frictionless spheres in suspension

悬浮液中无热摩擦球体压缩驱动干扰的临界尺度

• DOI: 10.1103/physreve.103.l040901
• 发表时间: 2021
• 期刊: Physical Review E
• 影响因子: 2.4
• 作者: Peshkov, Anton;Teitel, S.
• 通讯作者: Teitel, S.

Memory in three-dimensional cyclically driven granular material

三维循环驱动颗粒材料中的记忆

• DOI: 10.1103/physreve.103.062906
• 发表时间: 2021
• 期刊: Physical Review E
• 影响因子: 2.4
• 作者: Benson, Zackery A.;Peshkov, Anton;Richardson, Derek C.;Losert, Wolfgang
• 通讯作者: Losert, Wolfgang

Experimentally Measuring Rolling and Sliding in Three-Dimensional Dense Granular Packings

三维致密颗粒填料中滚动和滑动的实验测量

• DOI: 10.1103/physrevlett.129.048001
• 发表时间: 2022
• 期刊: Physical Review Letters
• 影响因子: 8.6
• 作者: Benson, Zackery A.;Peshkov, Anton;Yunger Halpern, Nicole;Richardson, Derek C.;Losert, Wolfgang
• 通讯作者: Losert, Wolfgang