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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Two-dimensional vesicle dynamics under shear flow: effect of confinement.

Badr Kaoui1, Jens Harting, Chaouqi Misbah

  • 1Technische Universiteit Eindhoven, Postbus 513, 5600 MB Eindhoven, The Netherlands. b.kaoui@tue.nl

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|July 30, 2011
PubMed
Summary

Confined vesicle dynamics under shear flow were simulated. Increasing confinement reduces vesicle inclination and tank-treading velocity, impacting effective fluid viscosity.

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Area of Science:

  • Fluid dynamics
  • Biophysics
  • Computational physics

Background:

  • Vesicle dynamics are crucial in biological systems and materials science.
  • Understanding vesicle behavior under confinement is essential for microfluidic applications.
  • Previous studies have limited focus on confinement effects on vesicle dynamics.

Purpose of the Study:

  • To investigate the dynamics of a single vesicle under shear flow in confined geometries.
  • To analyze the impact of confinement on vesicle inclination angle and membrane velocity.
  • To determine the influence of confinement on the effective viscosity of vesicle-fluid mixtures.

Main Methods:

  • Two-dimensional lattice-Boltzmann simulations were employed.
  • An immersed boundary method approach was adapted for vesicle membrane tracking.
  • Eulerian and Lagrangian meshes were used for fluid flow and vesicle membrane, respectively.

Main Results:

  • Simulations successfully reproduced known vesicle equilibrium shapes and dynamics.
  • Vesicle steady inclination angle and tank-treading velocity decrease with increasing confinement.
  • Effective viscosity shows nonlinear behavior and non-monotonic dependence on reduced volume at high confinement.

Conclusions:

  • Confinement significantly alters vesicle dynamics in shear flow.
  • The degree of confinement is a critical parameter influencing vesicle orientation and motion.
  • Findings provide insights into the rheological properties of confined vesicle suspensions.