| 项目编号: | 1554044
|
| 项目名称: | CAREER: Suspensions of Noncolloidal Particles in Yield Stress Fluids: Fluid Mechanics, Rheology and Microstructure |
| 作者: | Sarah Hormozi
|
| 承担单位: | Ohio University
|
| 批准年: | 2016
|
| 开始日期: | 2016-04-01
|
| 结束日期: | 2021-03-31
|
| 资助金额: | 512249
|
| 资助来源: | US-NSF
|
| 项目类别: | Standard Grant
|
| 国家: | US
|
| 语种: | 英语
|
| 特色学科分类: | Engineering - Chemical, Bioengineering, Environmental, and Transport Systems
|
| 英文关键词: | particle
; slurry
; fluid dynamical behavior
; career project
; career conference
; macroscopic rheology
; concentrated suspension
; yield stress
; noncolloidal particle
; project
; local stress component
|
| 英文摘要: | CBET - 1554044
PI: Hormozi, Sarah
Slurries are concentrated suspensions of particles in a viscous liquid. They are found in natural settings, such as landslides, mudslides, and underwater avalanches, and in industrial settings, such as in tailings from mining operations. The goal of this CAREER project is to develop experimental and modeling methods to examine the fluid dynamical behavior of slurries when the viscous liquid that conveys the particles exhibits complex behavior on its own. The experiments will cover a wide range of flow regimes, and the results will fill an important knowledge gap in understanding the flow characteristics of slurries. This understanding is essential to make accurate predictions of how natural disasters start and spread and to avoid or reduce their impacts. Data acquired in the project will be useful to researchers who are interested in developing new models of slurries and to practitioners who develop equipment to process these complex materials. In addition, results from the project will be incorporated into classes at Ohio University. Researchers working on the project will participate in a variety of outreach programs, including TechSavvy, a career conference for girls and the adults who support them, and a residential Technology Camp for high school girls that provides opportunities for young women to explore careers in engineering and technology.
This CAREER project focuses on the development of experimental and modeling techniques to investigate rheological properties of slurries in which the suspending liquid by itself exhibits non-Newtonian behavior, including a yield stress and shear-thinning. For example, this is the case in mine tailings and debris, where small colloidal particles impart non-Newtonian behavior to the suspending liquid that affects the rheology of suspensions of larger, noncolloidal particles. The experiments will span low-Reynolds number to inertial regimes, and will determine the particle pressure tensor and the kinetics of shear-induced migration of the particles. Radiography and three-dimensional micro-tomography will be used to determine the local volume fraction of the particles and the local stress components. Particle imaging and tracking velocimetry will be used to characterize the underlying microstructure, i.e., the spatial and temporal arrangement of the particles, and connect it to the macroscopic rheology of the slurry. Results will be used to develop accurate theoretical frameworks to model geophysical flows and predict initiation, spreading dynamics and runout, which will help limit the impact of natural disasters. |
| 资源类型: | 项目
|
| 标识符: | http://119.78.100.158/handle/2HF3EXSE/92559
|
| Appears in Collections: | 全球变化的国际研究计划
科学计划与规划
|
|
There are no files associated with this item.
|
| Recommended Citation: | |
Sarah Hormozi. CAREER: Suspensions of Noncolloidal Particles in Yield Stress Fluids: Fluid Mechanics, Rheology and Microstructure. 2016-01-01.
|
|
|