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Condensed Matter > Soft Condensed Matter

arXiv:2302.03546 (cond-mat)
[Submitted on 7 Feb 2023 (v1), last revised 3 Jul 2023 (this version, v2)]

Title:Suspensions of viscoelastic capsules: effect of membrane viscosity on transient dynamics

Authors:Fabio Guglietta, Francesca Pelusi, Marcello Sega, Othmane Aouane, Jens Harting
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Abstract:Membrane viscosity is known to play a central role in the transient dynamics of isolated viscoelastic capsules by decreasing their deformation, inducing shape oscillations and reducing the loading time, that is, the time required to reach the steady-state deformation. However, for dense suspensions of capsules, our understanding of the influence of the membrane viscosity is minimal. In this work, we perform a systematic numerical investigation based on coupled immersed boundary -- lattice Boltzmann (IB-LB) simulations of viscoelastic spherical capsule suspensions in the non-inertial regime. We show the effect of the membrane viscosity on the transient dynamics as a function of volume fraction and capillary number. Our results indicate that the influence of membrane viscosity on both deformation and loading time strongly depends on the volume fraction in a non-trivial manner: dense suspensions with large surface viscosity are more resistant to deformation but attain loading times that are characteristic of capsules with no surface viscosity, thus opening the possibility to obtain richer combinations of mechanical features.
Subjects: Soft Condensed Matter (cond-mat.soft); Computational Physics (physics.comp-ph); Fluid Dynamics (physics.flu-dyn)
Cite as: arXiv:2302.03546 [cond-mat.soft]
  (or arXiv:2302.03546v2 [cond-mat.soft] for this version)
  https://doi.org/10.48550/arXiv.2302.03546

Submission history

From: Fabio Guglietta [view email]
[v1] Tue, 7 Feb 2023 15:54:37 UTC (64,604 KB)
[v2] Mon, 3 Jul 2023 20:25:42 UTC (32,296 KB)
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