Controlling complex fluid displacement flows in confined geometry

控制受限几何形状中的复杂流体驱替流

• 批准号: RGPIN-2015-04829
• 负责人: Taghavi, SeyedMohammad
• 金额: $ 1.68万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2020
• 资助国家: 加拿大
• 起止时间: 2020-01-01 至 2021-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=708516
• 关键词: Controlling; complex; fluid; displacement; flows

The movement of one fluid by another fluid in confined geometry is one of the most common processes in Nature. These interesting flows also have many industrial applications, for example, in the field of energy, particularly in the petroleum industry (e.g., in oil and gas exploration, extraction and transportation), manufacturing (e.g., coating flows, co-extrusion), biomedical applications (e.g., digestion, clearing of mucus plugs in alveoli) and food processing (e.g., biofilm removal, cleaning of processing machinery). The fluids involved frequently exhibit various interesting complex rheological features such as shear-thinning, shear-thickening, viscoelastic, viscoplastic and thixotropic effects. These displacement flows are often vulnerable to well-known instabilities that may develop at the fluid-fluid interface, which depending on the situation may be undesirable or desirable. This sparks a significant research question: How can one control and manipulate complex fluid displacement flows, e.g., by hindering/triggering interfacial instabilities to achieve desired flow patterns and behaviours? Relevant to this question, our long-term research goal is to develop comprehensive controlling strategies to manipulate the advancement and penetration of complex fluids into one another, hinder/trigger the associated instabilities, induce/deter certain pattern formations, and maximize/minimize the resulting mixing. This enables one to precisely predict and design behaviours of multi-fluid flows in relevant systems, reducing concomitant negative impacts associated to unpredictability and uncontrollability of these flows. In the short-term, motivated by a number of recent studies that propose controlling strategies for simple (Newtonian) fluid displacement flows, we will extend three controlling strategies for complex (non-Newtonian) fluid displacement flows through studying: (i) Non-Newtonian fluid displacement flows in non-uniform geometry; (ii) Non-Newtonian fluid displacement flows with a variable imposed flow rate; (iii) Non-Newtonian fluid displacement flows in elastic-walled geometry. The recent developments for Newtonian fluids suggest that our research is completely feasible; while recalling that most natural and industrial displacing/displaced fluids are non-Newtonian advocates that it is absolutely necessary. Our proposed research programme will contribute to the training of Highly Qualified Personnel through strongly involving both graduate and undergraduate students. We will investigate the rich research topics proposed through developing rigorous analytical models (e.g., lubrication-type models), using experimental techniques (e.g., flow visualization and measurements), and exercising advanced computational fluid dynamics methods (e.g., high quality simulations by open source codes).

一种在封闭的几何形状中通过另一种流体在自然界中最常见的过程之一。这些有趣的流也有许多工业应用，例如在能源领域，尤其是在石油行业（例如，在石油和天然气勘探，提取和运输中），制造业（例如，涂层流，涂层，共脱位），生物医学应用，植物（例如，消化，Alveoli Contracting and Alveoli Processing（E.G）（E.G）（E.G）。机械）。流体涉及的流体经常暴露出各种有趣的复杂流变特征，例如剪切，剪切粘附，粘弹性，粘粘性和薄质效应。这些位移流通常容易受到在流体流体界面上可能发展的知名稳定性的影响，这取决于情况可能是不希望或不可取的。这引发了一个重要的研究问题：一个人如何控制和操纵复杂的流体位移流，例如，通过阻碍/触发界面不稳定性来实现所需的流动模式和行为？与这个问题相关的是，我们的长期研究目标是制定全面的控制策略，以操纵复杂的液体相互发展和渗透彼此，阻碍/触发相关的不稳定性，诱导/阻止某些模式形成，并最大化/最小化所得混合。这使人们能够精确预测和设计相关系统中多流体流的行为，从而减少了与这些流动的不可预测性和不可控制性相关的伴随负面影响。在短期内，由许多最近的研究激发，这些研究提出了对简单（牛顿）流体流量流的控制策略，我们将扩展三种控制策略的复杂（非牛顿）流体流体位移流，通过研究：（i）非牛顿式流体流体流量：（i）在非均匀的几何体中； （ii）具有可变施加流速的非牛顿流体位移流动； （iii）弹性壁几何形状中的非牛顿流体位移流动。牛顿流体的最新发展表明，我们的研究是完全可行的。在回忆起大多数自然和工业流离失所/流离失所的流体是非牛顿的倡导者，这是绝对必要的。我们提出的研究计划将通过强烈参与研究生和本科生对高素质人员的培训做出贡献。我们将使用实验技术（例如，流动可视化和测量值）以及进行先进的计算流体动力学方法（例如，通过开源代码进行高质量的模拟）来研究通过开发严格的分析模型（例如润滑类型模型）提出的丰富研究主题。