Collisional Interactions in a Viscous Fluid
粘性流体中的碰撞相互作用
基本信息
- 批准号:0314005
- 负责人:
- 金额:$ 37.9万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2003
- 资助国家:美国
- 起止时间:2003-11-15 至 2007-10-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
COLLISIONAL INTERACTIONS IN A VISCOUS FLUID M.L. Hunt and C.E. Brennen Abstract The proposed work investigates particulate flows in which both hydrodynamic effects and collisional interactions are important. This research lies between suspension flows and granular material flows and encompasses debris flows, slurry and sludge transport, milling and mining applications, sediment transport, abrasive machining, polishing and surface erosion technologies. These flows are characterized by having fluid and solid phases of comparable density, solid fractions approaching that of a packed bed, and particle Reynolds and Stokes numbers greater than unity. The proposed work emphasizes a fundamental understanding of the fluid and solid mechanics of collisional interactions, including the development of models and computational tools, and the education of students and scholar through research opportunities. The research focuses on the interactions of individual particles colliding with a surface. To date, we have done extensive measurements of normal particle collisions. These results demonstrated that below a critical Stokes number, about 10, all of the particles kinetic energy is lost during the compression of the lubrication film with no rebound of the particle. Above a second Stokes number, about 2000, the particle rebounds with negligible effect of the lubrication layer. The proposed work expands on these experiments by measuring oblique collisions in which the particle may roll or slide. Related experiments involve binary-particle collisions in a liquid, which differs from the particle-wall collisions because the target particle may move prior to the impact. Both of these experiments would be performed for Stokes number from 10 to 3000, and include different material properties and surface conditions. Measurements are also proposed of the surface deformation and erosion during impact using controlled collisions with a single particle in a viscous fluid. Both normal and oblique collisions will be examined for different Stokes numbers and material properties. An analytical study will accompany the measurements. The final subject involves exploratory measurements of the fluid motion resulting from a particle collision. As a particle approaches a wall, the fluid in the gap is forced radially outward, and then the fluid reverses direction as the particle rebounds. These flow reversals affect the wall shear stress in the single particle experiments and in dense particulate flows. An integral part of this research work is the education students and scholars. The PIs have included students in all aspects of their research, including the authoring of technical papers and presentations at appropriate scientific meetings. In prior and ongoing research, the PIs have placed a heavy emphasis on the inclusion of student from underrepresented groups and extensive involvement of undergraduate students. Some of these undergraduates have been recognized for their outstanding research, and approximately half have gone on to engineering graduate programs. The PIs have also presented their research to local schools through community and campus programs.
粘性流体中的碰撞相互作用亨特和C.E. Brennen摘要 拟议的工作调查颗粒流中的流体动力学效应和碰撞相互作用是很重要的。这项研究介于悬浮流和颗粒物质流之间,包括泥石流、泥浆和污泥运输、铣削和采矿应用、沉积物运输、磨料加工、抛光和表面侵蚀技术。这些流动的特征在于具有相当密度的流体和固体相,接近填充床的固体分数,以及大于1的颗粒雷诺数和斯托克斯数。拟议的工作强调对碰撞相互作用的流体和固体力学的基本理解,包括模型和计算工具的开发,以及通过研究机会对学生和学者的教育。 研究重点是单个粒子与表面碰撞的相互作用。到目前为止,我们已经对正常粒子碰撞进行了广泛的测量。这些结果表明,低于临界斯托克斯数,约10,所有的颗粒动能损失期间的润滑膜的压缩没有反弹的颗粒。在第二个斯托克斯数以上,约2000,颗粒反弹,润滑层的影响可以忽略不计。拟议的工作扩展了这些实验测量斜碰撞中的粒子可能滚动或滑动。相关的实验涉及液体中的二元粒子碰撞,这与粒子壁碰撞不同,因为目标粒子可能在碰撞之前移动。这两个实验都将针对斯托克斯数从10到3000进行,并且包括不同的材料性质和表面条件。 还提出了测量的表面变形和侵蚀过程中的影响,使用控制碰撞与一个单一的颗粒在粘性流体。对于不同的斯托克斯数和材料性质,将检查正碰撞和斜碰撞。分析研究将伴随测量。最后一个主题涉及探索性测量的流体运动所造成的粒子碰撞。当颗粒接近壁时,差距中的流体被迫径向向外,然后流体随着颗粒反弹而反向。在单颗粒实验和稠密颗粒流中,这些流动逆转影响壁面剪切应力。 这项研究工作的一个组成部分是教育学生和学者。PI将学生纳入其研究的各个方面,包括在适当的科学会议上撰写技术论文和演讲。在之前和正在进行的研究中,PI非常重视将代表性不足的群体的学生纳入其中,并广泛参与本科生的工作。这些本科生中的一些人因其杰出的研究而受到认可,大约一半的人继续攻读工程研究生课程。PI还通过社区和校园项目向当地学校介绍了他们的研究。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Melany Hunt其他文献
Melany Hunt的其他文献
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{{ truncateString('Melany Hunt', 18)}}的其他基金
I-Corps: Megaton carbon capture technology for point-source emitters
I-Corps:用于点源排放者的百万吨级碳捕获技术
- 批准号:
2309344 - 财政年份:2023
- 资助金额:
$ 37.9万 - 项目类别:
Standard Grant
Liquid-Solid Flows with Inertia and Particle Settling
具有惯性和颗粒沉降的液固流
- 批准号:
1706166 - 财政年份:2017
- 资助金额:
$ 37.9万 - 项目类别:
Standard Grant
Experiments, Simulations and Models of Colliding Particles in a Liquid
液体中粒子碰撞的实验、模拟和模型
- 批准号:
0730284 - 财政年份:2007
- 资助金额:
$ 37.9万 - 项目类别:
Standard Grant
Liquid-Saturated Granular Material Flows
液体饱和颗粒材料流
- 批准号:
9908430 - 财政年份:2000
- 资助金额:
$ 37.9万 - 项目类别:
Standard Grant
Heat Transfer in Flows of Granular Materials
颗粒材料流动中的传热
- 批准号:
9530357 - 财政年份:1996
- 资助金额:
$ 37.9万 - 项目类别:
Continuing Grant
Presidential Young Investigators Award: Convective Transport Complex Flows
总统青年研究员奖:对流传输复杂流
- 批准号:
8958347 - 财政年份:1989
- 资助金额:
$ 37.9万 - 项目类别:
Continuing Grant
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