Liu, Qingsong;
(2025)
Fluid-particle interactions in channel flows.
Doctoral thesis (Ph.D), UCL (University College London).
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Abstract
This thesis describes a research study on mathematical modelling of solid particle trajectories in a fluid-filled channel. Inspired by the idea that ice crystal particles can clog sensors on aircraft wings, the original motivation for the research is to avoid collisions between particles and channel walls. Therefore most of the twodimensional solution testing stops at the moment when the particle collides with the channel wall. The thesis, which combines numerical and analytical work, begins with investigations of the trajectory of a single particle in a fixed shape channel within which the oncoming inviscid fluid flow is uniform; here we find sustained oscillations provide a possible way to keep the particle moving in the channel without collision. Then we move on to the motion trajectories of a particle in an expanding or contracting channel subject to various different channel shapes. In the subsequent chapter we create a multi-particle motion model. Besides the fixed shape model or the regular shape model, the motion trajectories of a particle in a flexible-walled channel whose deformation is caused by the pressure effects are also considered in this thesis. In the final two chapters, the motion trajectories of a particle in a fluid within flow at low Reynolds number are addressed, followed by the overall conclusion.
| Type: | Thesis (Doctoral) |
|---|---|
| Qualification: | Ph.D |
| Title: | Fluid-particle interactions in channel flows |
| Open access status: | An open access version is available from UCL Discovery |
| Language: | English |
| Additional information: | Copyright © The Author 2025. Original content in this thesis is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) Licence (https://creativecommons.org/licenses/by-nc/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10203826 |
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