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。粒状和软质物质在自然界和日常生活中无处不在。其中一类材料是干粒状材料，包括粉末、种子、颗粒、沙子和砾石。另一类属于软物质材料，通常由悬浮在流体中的颗粒组成。这些包括：由一种液体的液滴悬浮在另一种液体中组成的乳液，如蛋黄酱、油醋汁和均质牛奶；泡沫：由悬浮在液体中的气泡组成的泡沫，如剃须膏、肥皂泡和搅打过的奶油；由悬浮在液体中的固体颗粒组成的悬浮物，如番茄酱、芥末和油漆。这些材料对于各种各样的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，再到材料的制造。在最简单的抽象层面上，人们可以认为这些材料是由大颗粒组成的，它们的热波动可以忽略不计，只有当它们相互接触时才相互作用，在这种情况下它们相互排斥。然而，尽管这看起来很简单，但令人惊讶的复杂行为可能会出现，特别是从流动的液体状态到刚性但无序的固体状态的转变，因为颗粒堆积密度或施加的应力是不同的。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干扰转变的性质，以及在剪切驱动流动下出现的这种材料的更一般行为，在剪切驱动流动中，相邻的颗粒层以不同的相对速度相互平行移动。不同的能量耗散机制，以及不同粒子形状的影响将被研究。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。本科学生将通过在地方和国家的研究会议上展示工作，获得科学研究和科学传播的经验。研究生将接受现代理论和高性能计算方法的训练，并体验理论与实验直接互动的研究。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从事这一领域的互补性实验和计算研究的国内和国际同事形成合作网络而得到加强。该奖项支持颗粒和软物质材料的理论和计算研究和教育。计算机模拟将用于研究颗粒和软物质材料在干扰过渡附近的不同方面的行为，这标志着随着颗粒堆积的增加，从流动的类液体状态突然转变为刚性但无序的固体状态。感兴趣的材料包括干颗粒物质、浆液中的致密颗粒、乳剂、泡沫、非布朗悬浮液和胶体。具体问题将进行研究，目的是增加对这类材料的流动液相和无序固相的理解，以及它们之间的转变。这些包括：(i)剪切流动材料在均匀环境中剪切带背后的物理机制；（ii）不连续剪切增厚、应变速率增加时剪应力的快速跳跃与微观颗粒间弹性摩擦之间的关系；（iii）摩擦粒子系统中各向同性挤压干扰与剪切干扰的区别；(4)取向有序和颗粒翻滚对非球面颗粒构成的物料剪切流动的影响；(v)非球面颗粒剪切驱动卡阻过渡的临界性；（六）颗粒表面凹凸度对剪切流变的影响。与在这些领域工作的实验小组合作将有助于告知和指导理论进展。该奖项反映了美国国家科学基金会的法定使命，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