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Rheology and structure of elastic capsule suspensions within rectangular channels
1Department of Mechanical Engineering, University of Arkansas, USA. pmillett@uark.edu.
Soft Matter
|February 13, 2023
Summary
This study simulates elastic capsule flow in channels, finding that multi-directional confinement hinders particle focusing. Channel shape significantly impacts apparent viscosity, extending the Fahraeus-Lindqvist effect to 2D.
Area of Science:
- Fluid dynamics
- Computational physics
- Biophysics
Background:
- Understanding the behavior of suspensions is crucial in various scientific and industrial applications.
- Elastic capsules in flow exhibit complex dynamics influenced by confinement and flow conditions.
Purpose of the Study:
- To investigate the pressure-driven flow of elastic capsule suspensions in slit and rectangular channels.
- To analyze the effects of channel geometry, Reynolds number (Re), and capillary number (Ca) on capsule dynamics and suspension viscosity.
Main Methods:
- Three-dimensional simulations using the Immersed Boundary Method and Lattice-Boltzmann Method.
- Systematic variation of channel dimensions, Re, and Ca for a fixed capsule volume fraction (0.1).
Main Results:
- Multi-directional confinement in rectangular channels impedes inertial focusing due to capsule-free layers.
- Unequal channel height and width lead to differing capsule-free layer thicknesses.
- Apparent viscosity is significantly affected by channel size and aspect ratio, with square channels showing maximal viscosity.
Conclusions:
- The study extends the Fahraeus-Lindqvist effect from 1D cylindrical channels to 2D rectangular channels.
- Channel geometry plays a critical role in dictating the flow behavior and effective viscosity of elastic capsule suspensions.
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