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Dynamic characteristics of a deformable capsule in a simple shear flow
Jingtao Ma1, Lincheng Xu1, Fang-Bao Tian1
1School of Engineering and Information Technology, University of New South Wales, Canberra, ACT 2600, Australia.
Physical Review. E
|April 3, 2019
Summary
This study explores how deformable capsules behave in shear flow, identifying four distinct dynamic regions based on flow parameters. Capsule deformation is influenced by fluid forces and membrane properties.
Area of Science:
- Fluid dynamics
- Computational physics
- Biophysics
Background:
- Understanding capsule dynamics in fluid flow is crucial for fields like microfluidics and cell mechanics.
- Previous studies often simplified capsule models or flow conditions.
Purpose of the Study:
- To investigate the dynamic characteristics of a 2D deformable capsule in simple shear flow.
- To map the behavior of capsules across a range of Reynolds numbers (Re) and dimensionless shear rates (G).
Main Methods:
- Utilized an immersed boundary-lattice Boltzmann method for simulations.
- Varied Reynolds number (Re) from 0.0125 to 2000 and dimensionless shear rate (G) from 0.001 to 0.5.
Main Results:
- Identified four distinct regions in the G-Re plane: viscous dominant, inertia dominant, transitional, and anomalous.
- Observed four typical dynamic behaviors: steady deformation, prerupture state, quasisteady deformation, and continuous elongation.
- Found that pressure distribution, fluid inertia, viscous stress, and membrane elasticity govern capsule behavior.
Conclusions:
- Capsule deformation is significantly affected by bending rigidity and internal-to-external viscosity ratio.
- Higher bending rigidity leads to smaller deformation; low bending rigidity has minimal impact.
- Increased internal-to-external viscosity ratio generally results in reduced capsule deformation.
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