权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Suspensions and Granular Media: Wet vs. Dry

悬浮液和颗粒介质：湿法与干法

基本信息

批准号：
0828563
负责人：
John Brady
金额：
$ 30万
依托单位：
California Institute of Technology
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2008
资助国家：
美国
起止时间：
2008-09-01 至 2012-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0828563&HistoricalAwards=false
关键词：
Suspensions Granular Media Wet vs.

项目摘要

CBET-0828563BradyProject SummaryIntellectual Merit: Suspensions and granular media are found widely in nature and industry. And although the two fields have developed independently, recently it has been noted that viscous suspensions and dry granular materials often display similar flow phenomena. Despite the similarities, the two fields nevertheless remain separate. Here we propose that this separation is unnecessary and that suspensions and granular media - wet and dry - actually correspond to different limiting behaviors of one common system. The linking parameter is the Stokes number - the ratio of the inertial to shear forces: small Stokes numbers correspond to viscous suspensions and high Stokes numbers to dry granular media. The proposed research is a simulation study covering the entire range of Stokes numbers (and concentrations) and thus explores the flow behavior and rheological connection between these two fields. Not only will we learn about this connection, we may also advance our understanding of both suspensions and granular media. This study also provides vital rheological data (shear and normal stresses, shear-induced diffusivities, microstructures, etc.) for inertial suspensions, of which there appears to be surprisingly little.Broader Impact: In a broader context, this research will help elucidate the behavior of an often called new state of matter - granular matter. Granular flow forms part of the larger area of multiphase flow with applications ranging from sediment transport in rivers and bays, to pneumatic conveying of minerals, to the production of pharmaceutical powders. The work will also engage PhD students who will become experts in computational methods, multiphase fluid physics and rheology. This research provides the foundation for modeling multiphase flows that has widespread application in science and technology.

CBET-0828563 Brady项目总结知识价值：悬浮液和颗粒介质广泛存在于自然界和工业中。虽然这两个领域是独立发展的，但最近人们注意到粘性悬浮体和干燥颗粒材料往往表现出类似的流动现象。尽管有相似之处，但这两个领域仍然是分开的。在这里，我们建议，这种分离是不必要的，悬浮液和颗粒介质-湿的和干的-实际上对应于一个共同的系统的不同的限制行为。关联参数是斯托克斯数-惯性力与剪切力的比值：小斯托克斯数对应于粘性悬浮液，高斯托克斯数对应于干燥颗粒介质。拟议的研究是一个模拟研究，涵盖了整个范围的斯托克斯数（和浓度），从而探讨了这两个领域之间的流动行为和流变学连接。我们不仅将了解这种联系，我们也可以推进我们对悬浮液和颗粒介质的理解。这项研究还提供了重要的流变数据（剪切应力和法向应力，剪切诱导扩散系数，微观结构等）。对于惯性悬浮，其中似乎有令人惊讶的很少。更广泛的影响：在更广泛的背景下，这项研究将有助于阐明一种通常被称为新的物质状态-颗粒物质的行为。颗粒流是多相流领域的一部分，其应用范围从河流和海湾中的沉积物输送，到矿物的气动输送，再到药物粉末的生产。这项工作还将吸引博士生，他们将成为计算方法，多相流体物理和流变学方面的专家。该研究为在科学技术中具有广泛应用的多相流建模奠定了基础。