Secondary flow vortices and their effect on fluid-solid transport

二次流涡及其对流固传输的影响

• 批准号: 2599538
• 金额: --
• 依托单位: University of Liverpool
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2021
• 资助国家: 英国
• 起止时间: 2021 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2599538
• 关键词: Secondary; flow; vortices; their; effect

This project aims to improve fundamental understanding regarding the interaction of various applied flow fields, and particularly so-called "secondary-flow" vortices, with solid particles. A series of simplified geometries will be chosen to study a wide range of flow conditions for both Newtonian and complex fluids, in the presence/absence of vortices, and its interaction on the solids bed in a controlled and systematic manner. This knowledge will then be used to update or generate new models for the solid's transport, settling, bed formation and resuspension criteria.Analytical solutions concerned with Newtonian fluid flow in various geometries are readily available from many sources. However, the same cannot be said of viscoelastic fluids. One aspect of this project will look at developing analytical solutions for such fluids in a series of geometries that develop secondary flows. We will then further expand these solutions, where possible, by considering various flow conditions as well as the interaction of these flow fields with solid particles. Given the complex rheologies of the fluids concerned, coupled with the addition of solid transport, we will also be considering several numerical and experimental techniques, where appropriate. We anticipate that this will lead to the development of new models of industrial significance. Another aspect of the project will focus on the T-channel geometry for complex fluid flows. Whilst Newtonian fluids are an ideal model for analytical solutions - the reality is that most fluids are non-Newtonian. For such fluids, there is always a possibility of flow instabilities. The very presence of these instabilities adds a further complication to the problem. Given the complexity of the problem, we will employ the use of the numerical and experimental techniques available to us.Subsequently, we will then consider the same T-channel geometry with a solids bed. Given that the geometry with a complex fluid flow is already a relatively intricate problem, we plan to use a combination of numerical simulations and experiments for this particular problem; and we envisage that this will allow us to develop appropriate new models for industrial applications. In the interest of completeness, we will also consider a Newtonian fluid for a T-channel with a solids bed.

该项目旨在提高对各种应用流场，特别是所谓的“二次流”漩涡与固体颗粒相互作用的基本理解。将选择一系列简化的几何图形来研究牛顿流体和复杂流体在存在/不存在漩涡的情况下的广泛流动条件，以及它在固体床上以受控和系统的方式相互作用。然后，这些知识将用于更新或生成固体运移、沉降、床层形成和再悬浮标准的新模型。有关牛顿流体在各种几何形状下流动的解析解很容易从许多来源获得。然而，粘弹性流体就不是这样了。该项目的一个方面将着眼于在一系列形成二次流的几何形状中为这些流体开发分析解决方案。然后，我们将进一步扩展这些解决方案，在可能的情况下，通过考虑各种流动条件以及这些流场与固体颗粒的相互作用。考虑到有关流体的复杂流变性，再加上固体输运，我们还将酌情考虑几种数值和实验技术。我们预计这将导致具有工业意义的新模式的发展。该项目的另一个方面将关注复杂流体流动的t形通道几何形状。虽然牛顿流体是解析解的理想模型，但现实是大多数流体都是非牛顿流体。对于这种流体，总是存在流动不稳定的可能性。这些不稳定因素的存在使问题更加复杂。考虑到问题的复杂性，我们将运用现有的数值和实验技术。随后，我们将考虑具有固体床层的相同t通道几何形状。考虑到复杂流体流动的几何问题已经是一个相对复杂的问题，我们计划使用数值模拟和实验相结合的方法来解决这个特殊的问题；我们设想这将使我们能够为工业应用开发合适的新模型。为了完整起见，我们还将考虑具有固体层的t型通道的牛顿流体。