Modeling and numerical simulation of yield stress fluids, and studies of viscoelasticity and confinement in the flow of two immiscible fluids

屈服应力流体的建模和数值模拟,以及两种不混溶流体流动中的粘弹性和约束研究

基本信息

项目摘要

The project is devoted to the modeling and numerical simulation of yield stress fluids, and studies of viscoelasticity and confinement in the flow of two immiscible fluids. The majority of the effort is focused on the following three themes: (i) Recent developments have enabled detailed measurements of the properties of a class of suspensions known as thixotropic yield stress fluids. An example is the flow of ketchup under applied stresses. Prior theoretical models require the input of measured quantities such as a yield stress, or to pose a phenomenological equation for the structure of the microcomponents. In contrast, a new mathematical perspective is explored in this project, in which yielding is an output of a systematically derived viscoelastic constitutive model in the limit of large relaxation time. Direct numerical simulations, in conjunction with multi-scale perturbation techniques based on slow and fast time scales, will enable the prediction of several experimentally observed phenomena, such as the hysteretic loop for up-down ramping of applied stress. (ii) The technological drive toward smaller scales has spawned new modeling and simulation challenges for droplet evolution in devices that are as small as the droplet itself. Confinement can enhance drop elongation, lead to new modes of drop breakup, and introduce numerical difficulties with respect to the constitutive laws and interface tracking. Capillary-focusing is a recently developed technology for the production of monodisperse submicron-sized droplets, which is not completely understood. This project sheds light on the physical mechanisms at work, by modeling the Hele-Shaw geometry and with direct numerical simulations. (iii) The advantages in combining the desired properties of two different liquids to produce a new blended mixture are well known. The quality of the blend is strongly dependent on the size of the dispersed droplets and their distribution. Therefore, it is of practical importance to understand how a droplet evolves in a matrix fluid, and to predict the influence of the rheological properties of each constituent. A novel viscoelastic height function algorithm will be developed and implemented in this project, and optimized for drop breakup simulations with possibly high gradients of stress. This project contributes to the understanding of physical mechanisms that control practical applications, such as recycling plastics for environmental sustainability, predicting the dynamics of droplets and particulates in confined flows for biomedical drug delivery, and understanding fundamental processes that improve nanofluidic technology for the pharmaceutical industry. The use of a computational infrastructure such as XSEDE will enable direct numerical simulations for comparison with experimental data. The knowledge gained from this research will be disseminated to a broader scientific audience at conferences on mathematics, physics and engineering, and through journal publications. The outcomes include the training of graduate students, outreach to the local K-12 audience, and cross-disciplinary partnerships.
该项目致力于屈服应力流体的建模和数值模拟,以及两种不混溶流体流动中的粘弹性和约束研究。大部分的努力集中在以下三个主题:(i)最近的发展已经能够详细测量一类悬浮液的特性,称为触变屈服应力流体。一个例子是番茄酱在施加应力下的流动。先前的理论模型需要输入测量的量,如屈服应力,或对微元件的结构提出一个唯象方程。与此相反,一个新的数学视角,探索在这个项目中,屈服是一个系统推导的粘弹性本构模型在大松弛时间的限制输出。直接数值模拟,结合多尺度扰动技术的基础上慢和快的时间尺度,将能够预测几个实验观察到的现象,如滞后环的上下斜坡施加的应力。(ii)朝向更小尺度的技术驱动已经为与液滴本身一样小的设备中的液滴演变产生了新的建模和模拟挑战。限制可以提高液滴的伸长率,导致新的模式的液滴破碎,并介绍了数值计算的困难方面的本构关系和界面跟踪。毛细管聚焦是最近发展起来的用于生产单分散亚微米尺寸液滴的技术,其尚未完全理解。该项目揭示了工作中的物理机制,通过建模的Hele-Shaw几何和直接数值模拟。(iii)将两种不同液体的所需性质组合以产生新的共混混合物的优点是众所周知的。共混物的质量在很大程度上取决于分散液滴的大小及其分布。因此,了解液滴在基质流体中的演化过程,预测各组分流变特性对液滴流变特性的影响,具有重要的实际意义。 一种新的粘弹性高度函数算法将在本项目中开发和实现,并优化可能具有高应力梯度的液滴破碎模拟。该项目有助于了解控制实际应用的物理机制,例如回收塑料以实现环境可持续发展,预测生物医学药物输送的受限流中液滴和颗粒的动态,以及了解改善制药行业纳米流体技术的基本过程。使用计算基础设施,如XSEDE将使直接数值模拟与实验数据进行比较。从这项研究中获得的知识将在数学、物理和工程会议上以及通过期刊出版物传播给更广泛的科学受众。其成果包括研究生的培训,推广到当地的K-12观众,和跨学科的伙伴关系。

项目成果

期刊论文数量(6)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Equibiaxial extension of a viscoelastic partially extending strand convection model with large relaxation time
大弛豫时间粘弹性部分延伸股对流模型的等双轴延伸
  • DOI:
    10.1007/s00397-015-0853-z
  • 发表时间:
    2015
  • 期刊:
  • 影响因子:
    2.3
  • 作者:
    Grant, Holly V.;Renardy, Yuriko
  • 通讯作者:
    Renardy, Yuriko
A volume-of-fluid formulation for the study of co-flowing fluids governed by the Hele-Shaw equations
  • DOI:
    10.1063/1.4817374
  • 发表时间:
    2013-08
  • 期刊:
  • 影响因子:
    4.6
  • 作者:
    S. Afkhami;Y. Renardy
  • 通讯作者:
    S. Afkhami;Y. Renardy
Stretch and hold: The dynamics of a filament governed by a viscoelastic constitutive model with thixotropic yield stress behavior
拉伸和保持:由具有触变屈服应力行为的粘弹性本构模型控制的长丝动力学
  • DOI:
    10.1063/1.4948661
  • 发表时间:
    2016
  • 期刊:
  • 影响因子:
    4.6
  • 作者:
    Renardy, Y.;Grant, H. V.
  • 通讯作者:
    Grant, H. V.
Thixotropy in yield stress fluids as a limit of viscoelasticity
屈服应力流体中的触变性作为粘弹性的极限
  • DOI:
    10.1093/imamat/hxw031
  • 发表时间:
    2016
  • 期刊:
  • 影响因子:
    1.2
  • 作者:
    Renardy, Michael;Renardy, Yuriko
  • 通讯作者:
    Renardy, Yuriko
Stability of shear banded flow for a viscoelastic constitutive model with thixotropic yield stress behavior
具有触变屈服应力行为的粘弹性本构模型的剪切带流稳定性
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Yuriko Renardy其他文献

Ferrofluids and magnetically guided superparamagnetic particles in flows: a review of simulations and modeling
  • DOI:
    10.1007/s10665-017-9931-9
  • 发表时间:
    2017-08-18
  • 期刊:
  • 影响因子:
    1.400
  • 作者:
    Shahriar Afkhami;Yuriko Renardy
  • 通讯作者:
    Yuriko Renardy
Pattern selection in the Bénard problem for a viscoelastic fluid
On the Stability of Inviscid Parallel Shear Flows with a Free Surface

Yuriko Renardy的其他文献

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{{ truncateString('Yuriko Renardy', 18)}}的其他基金

Computational study of drop deformation in systems with two immiscible liquids
两种不混溶液体体系中液滴变形的计算研究
  • 批准号:
    0907788
  • 财政年份:
    2009
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Standard Grant
The development and implementation of algorithms to investigate drop fragmentation under shear for viscoelastic liquids with surfactant
研究含表面活性剂的粘弹性液体在剪切作用下液滴破碎的算法的开发和实施
  • 批准号:
    0456086
  • 财政年份:
    2005
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Standard Grant
Interfacial Processing for Emulsions: Droplet Breakup with Inertia, Non-Newtonian and Surfactant Effects
乳液的界面处理:惯性、非牛顿和表面活性剂效应的液滴破碎
  • 批准号:
    0090381
  • 财政年份:
    2001
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Continuing Grant
U.S.-France Cooperative Research: Numerical Investigation of Two-Fluid Flows of Viscous Fluids
美法合作研究:粘性流体二流流动的数值研究
  • 批准号:
    9815106
  • 财政年份:
    1999
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Standard Grant
Interfacial Dynamics in Bicomponent Materials: Viscous, Viscoelastic and Thermal Effects
双组分材料中的界面动力学:粘性、粘弹性和热效应
  • 批准号:
    9612308
  • 财政年份:
    1997
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Continuing Grant
Interfacial Shapes in the Design of Composite Polymeric Materials
复合高分子材料设计中的界面形状
  • 批准号:
    9307238
  • 财政年份:
    1993
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Continuing Grant
Mathematical Sciences: Stability and Bifurcation in Two-Layer Flows
数学科学:两层流的稳定性和分岔
  • 批准号:
    8902166
  • 财政年份:
    1989
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Standard Grant
Mathematical Sciences: Stability and Bifurcation in Two-Layer Shearing Flows
数学科学:两层剪切流的稳定性和分岔
  • 批准号:
    8720298
  • 财政年份:
    1988
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Standard Grant
Mathematical Sciences: Stability and Bifurcation in Fluid Dynamics
数学科学:流体动力学的稳定性和分岔
  • 批准号:
    8615203
  • 财政年份:
    1986
  • 资助金额:
    $ 19.28万
  • 项目类别:
    Standard Grant

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