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Micro-capsules in shear flow.

R Finken1, S Kessler, U Seifert

  • 1II. Institut für Theoretische Physik, Universität Stuttgart, Stuttgart, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|April 22, 2011
PubMed
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Flow-induced shape changes in elastic capsules are crucial. Our study reveals these deformations significantly impact capsule dynamics, resolving discrepancies in theoretical models and providing new insights into phase transitions.

Area of Science:

  • Fluid dynamics
  • Soft matter physics
  • Biophysics

Background:

  • Elastic capsules exhibit complex behaviors in fluid flow, including tumbling and tank-treading.
  • Existing theoretical models often simplify capsule dynamics by assuming fixed shapes, leading to discrepancies with experimental and numerical observations.

Purpose of the Study:

  • To investigate the significant role of shape changes in the dynamics of elastic capsules under various flow conditions.
  • To resolve discrepancies between theoretical predictions and numerical simulations of capsule motion in shear flow.
  • To classify dynamical phase transitions and determine phase boundaries.

Main Methods:

  • Expansion of exact equations of motion for small deformations.
  • Numerical simulations of capsule dynamics.

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  • Analytical calculations for phase boundaries.

    • Main Results:

    • Shape changes are found to play a dominant role in capsule dynamics, not just small deformations.
    • Dynamical phase transitions were classified, with phase boundaries determined as a function of viscosity contrast and flow rates (shear and elongational).

    Conclusions:

    • The study highlights the critical importance of considering dynamic shape changes for accurate modeling of elastic capsule behavior in flows.
    • Provides a framework for understanding transitions between different motion regimes and offers perspectives for future research, including thermal fluctuations and stochastic thermodynamics.