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Controlling viscous fingering with fluid-structure interactions

通过流固耦合控制粘性指法

基本信息

批准号：
EP/P009751/1
负责人：
Christopher MacMinn
金额：
$ 12.88万
依托单位：
University of Oxford
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2017
资助国家：
英国
起止时间：
2017 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=EP%2FP009751%2F1
关键词：
Controlling viscous fingering fluid structure

项目摘要

Viscous fingering is a classical hydrodynamic instability that occurs when a fluid is injected into a porous medium or Hele-Shaw cell that already contains a more viscous fluid. The result is that the invading fluid will propagate through the defending fluid in narrow, finger-like channels rather than displacing it uniformly. As with most instabilities, viscous fingering can be desirable or undesirable---For example, it has a strong and adverse impact on enhanced oil recovery and many manufacturing processes, but it can also be exploited to promote mixing in microfluidic devices. In these and other applications, it would be extremely useful to be able to suppress, enhance, or otherwise control this phenomenon.The prospect of controlling hydrodynamic instabilities such as viscous fingering is a long-standing challenge across engineering. One promising approach for achieving this is by manipulating the flow with a moveable or deformable solid structure. Most previous efforts to control instabilities via such fluid-structure interactions (FSI) have been directed at inertial flows (e.g., aerodynamic drag and turbulence), but this idea also has clear relevance to viscous flows (e.g., in microfluidics, biomedical engineering, and subsurface flow), including viscous fingering.The goal of this project is to strengthen and broaden our understanding of the impact of FSI on viscous flows in general, and on viscous fingering in particular. We will first develop a novel apparatus for measuring and controlling the impact of FSI on viscous flow in a Hele-Shaw cell. Then, by combining high-resolution experiments in this system with mathematical modelling, we will develop a new strategy for controlling viscous fingering. This strategy for enhancing or suppressing viscous fingering can then be applied to a wide variety of practical challenges, from microfluidics to enhanced oil recovery.

粘性指进是一种经典的流体动力学不稳定性，当流体被注入到已经包含更粘性流体的多孔介质或Hele-Shaw单元中时发生。其结果是，入侵的流体将通过狭窄的手指状通道中的防御流体传播，而不是均匀地将其置换。与大多数不稳定性一样，粘性指进可能是期望的或不期望的-例如，它对提高石油采收率和许多制造过程具有强烈的不利影响，但它也可以用于促进微流体装置中的混合。在这些和其他应用中，能够抑制、增强或以其他方式控制这种现象将非常有用。控制流体动力不稳定性（例如粘性指进）的前景是整个工程领域长期存在的挑战。实现这一点的一种有前途的方法是通过用可移动或可变形的固体结构来操纵流动。通过这种流体-结构相互作用（FSI）来控制不稳定性的大多数先前的努力已经针对惯性流（例如，空气动力学阻力和湍流），但是该思想也与粘性流有明显的相关性（例如，这个项目的目标是加强和扩大我们对FSI对粘性流动的影响的理解，特别是对粘性指进的理解。我们将首先开发一种新的装置，用于测量和控制FSI对Hele-Shaw池中粘性流动的影响。然后，通过在该系统中的高分辨率实验与数学建模相结合，我们将开发一种新的控制粘性指进的策略。这种增强或抑制粘性指进的策略可以应用于从微流体到提高石油采收率的各种实际挑战。