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: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=638895
• 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:

在有限的几何形状中，一种流体与另一种流体的运动是自然界中最常见的过程之一。这些令人感兴趣的流也具有许多工业应用，例如在能源领域，特别是在石油工业中（例如，在石油和天然气勘探、开采和运输中），制造业（例如，涂布流，共挤出），生物医学应用（例如，消化，清除肺泡中的粘液栓）和食品加工（例如，生物膜去除、加工机械的清洁）。所涉及的流体经常表现出各种有趣的复杂的流变特性，如剪切变稀，剪切增稠，粘弹性，粘塑性和触变效应。这些位移流通常易受可能在流体-流体界面处发展的公知的不稳定性的影响，这取决于情况可能是不期望的或期望的。这引发了一个重要的研究问题：如何控制和操纵复杂的流体驱替流动，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？与此相关的问题，我们的长期研究目标是开发全面的控制策略，以操纵复杂流体的推进和渗透到另一个，阻碍/触发相关的不稳定性，诱导/阻止某些模式的形成，并最大化/最小化所产生的混合。这使得人们能够精确地预测和设计相关系统中多流体流动的行为，减少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，受最近提出简单（牛顿）流体驱替流控制策略的许多研究的启发，我们将通过研究扩展复杂（非牛顿）流体驱替流的三种控制策略：