Passive and active particles in viscoelastic fluids
Abstract/Contents
- Abstract
- Particles suspended in viscoelastic fluids appear in a variety of settings, both industrial and biological. Understanding particle-fluid interactions is a key building block in predicting the behavior of these systems, as the material properties of the particle and fluid affect stress distributions in a suspension under flow, or the motion of a swimming microorganism. We first examine capsules suspended in viscoelastic fluids for two different flows of rheological significance that appear in many applications. In shear flows, we find that increasing the suspending fluid elasticity leads to a non-monotonic trend in the suspension shear viscosity, decreasing the particle deformation, and decreasing tensions in the capsule membrane. For pressure-driven flow of dilute spherical capsules and RBCs through ducts at high confinement, increasing fluid elasticity leads to a monotonic increase in the particle deformation, while the suspension extrusional viscosity exhibits non-monotonic behavior. Replacing the spherical capsules with a red blood cell gives similar trends in the suspension rheology and particle deformation, but weaker trends in the membrane tension distributions, due to the reduced volume of the red blood cells. Finally, we study "swirlers": swimmers propelled by normal stresses in viscoelastic fluids. We show how the steady swim speed under weakly elastic conditions can be calculated for general arbitrary axisymmetric geometries, via the reciprocal theorem and the solution of two Newtonian flow problems, and derive the unsteady swim speed as an analytic function of a specified unsteady tail rotation rate and the material properties of the suspending fluid. This study expands upon the design space for a ``swimming rheometer'' by increasing its functionality to make and interpret rheological measurements.
Description
| Type of resource | text |
|---|---|
| Form | electronic resource; remote; computer; online resource |
| Extent | 1 online resource. |
| Place | California |
| Place | [Stanford, California] |
| Publisher | [Stanford University] |
| Copyright date | 2023; ©2023 |
| Publication date | 2023; 2023 |
| Issuance | monographic |
| Language | English |
Creators/Contributors
| Author | Neo, Boon Siong, (Researcher in chemical engineering) |
|---|---|
| Degree supervisor | Shaqfeh, Eric S. G. (Eric Stefan Garrido) |
| Thesis advisor | Shaqfeh, Eric S. G. (Eric Stefan Garrido) |
| Thesis advisor | Fuller, Gerald G |
| Thesis advisor | Qin, Jian, (Professor of Chemical Engineering) |
| Degree committee member | Fuller, Gerald G |
| Degree committee member | Qin, Jian, (Professor of Chemical Engineering) |
| Associated with | Stanford University, School of Engineering |
| Associated with | Stanford University, Department of Chemical Engineering |
Subjects
| Genre | Theses |
|---|---|
| Genre | Text |
Bibliographic information
| Statement of responsibility | Boon Siong Neo. |
|---|---|
| Note | Submitted to the Department of Chemical Engineering. |
| Thesis | Thesis Ph.D. Stanford University 2023. |
| Location | https://purl.stanford.edu/rd160rc9664 |
Access conditions
- Copyright
- © 2023 by Boon Siong Neo
- License
- This work is licensed under a Creative Commons Attribution Non Commercial 3.0 Unported license (CC BY-NC).
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