UNS: Dynamics and Rheology of Concentrated Suspensions of Rigid Rods: Effects of Confinement

UNS：刚性棒浓缩悬浮液的动力学和流变学：约束的影响

• 批准号: 1511787
• 负责人: Jason Butler
• 金额: $ 30.17万
• 依托单位: University of Florida
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-08-01 至 2021-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1511787&HistoricalAwards=false
• 关键词: UNS; Dynamics; Rheology; Concentrated; Suspensions

CBET - 1511787PI: Jason ButlerFibers often are added to materials to provide extra strength and improve lifetime. However, adding fibers to a material complicates processing, because the fibers cause changes in the physical properties of the material during flow. This project will conduct experiments and computer simulations of the flow behavior of suspensions of rigid rods in a viscous liquid. The project will examine concentrated suspensions where the rods interact with each other during flow. Furthermore, the project will focus on the effects of nearby bounding walls on the structure and physical properties of the suspension. Results of the project will provide information that engineers who process fibrous materials can use in process design to enhance material properties. The project will provide research training for graduate students, research involvement for interested undergraduates, and opportunities to enhance international collaborations through established initiatives at the University of Florida.The rheology of concentrated fiber suspensions will be studied experimentally in a series of devices. To examine effects of confinement, the distance between bounding walls in the devices will be varied. The effects of nearby walls on the microstructure of the suspension will be determined by imaging the rods. Changes in the microstructure due to confinement will be correlated with changes in fluid rheology. Experimental measurements will be compared to simulations with periodic boundary condition or with bounding walls to examine connections between microstructure, confinement, and rheology. In addition to clarifying the influence of confinement, the project will identify the physical mechanisms that control structure and dynamics of concentrated suspensions of rods.

CBET - 1511787PI：Jason Butler 纤维通常添加到材料中以提供额外的强度并延长使用寿命。 然而，向材料中添加纤维会使加工变得复杂，因为纤维会导致材料在流动过程中物理性能发生变化。 该项目将对刚性棒悬浮液在粘性液体中的流动行为进行实验和计算机模拟。 该项目将检查流动过程中杆彼此相互作用的浓缩悬浮液。 此外，该项目将重点研究附近围墙对悬架结构和物理性能的影响。 该项目的结果将为处理纤维材料的工程师提供可在工艺设计中使用的信息，以增强材料性能。 该项目将为研究生提供研究培训，为感兴趣的本科生提供研究参与，并提供通过佛罗里达大学既定举措加强国际合作的机会。浓缩纤维悬浮液的流变学将在一系列设备中进行实验研究。 为了检查限制的影响，设备中边界墙之间的距离将发生变化。 附近墙壁对悬浮液微观结构的影响将通过对杆进行成像来确定。 由于限制而引起的微观结构的变化将与流体流变学的变化相关。 实验测量结果将与周期性边界条件或边界墙的模拟进行比较，以检查微观结构、约束和流变学之间的联系。 除了阐明约束的影响外，该项目还将确定控制集中悬浮棒的结构和动力学的物理机制。