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

Published online by Cambridge University Press:  13 September 2023

Fabio Guglietta Open the ORCID record for Fabio Guglietta [Opens in a new window] ,
Francesca Pelusi Open the ORCID record for Francesca Pelusi [Opens in a new window] ,
Marcello Sega Open the ORCID record for Marcello Sega [Opens in a new window] ,
Othmane Aouane Open the ORCID record for Othmane Aouane [Opens in a new window]  and
Jens Harting Open the ORCID record for Jens Harting [Opens in a new window]
Fabio Guglietta*
Affiliation:
Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Cauerstraße 1, 91058 Erlangen, Germany
Francesca Pelusi
Affiliation:
Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Cauerstraße 1, 91058 Erlangen, Germany
Marcello Sega
Affiliation:
Department of Chemical Engineering, University College London, London WC1E 7JE, UK
Othmane Aouane
Affiliation:
Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Cauerstraße 1, 91058 Erlangen, Germany
Jens Harting
Affiliation:
Helmholtz Institute Erlangen-Nürnberg for Renewable Energy (IEK-11), Forschungszentrum Jülich, Cauerstraße 1, 91058 Erlangen, Germany Department of Chemical and Biological Engineering and Department of Physics, Friedrich-Alexander-Universität Erlangen-Nürnberg, Cauerstraße 1, 91058 Erlangen, Germany
*
Email address for correspondence: f.guglietta@fz-juelich.de
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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.

JFM classification

Biological Fluid Dynamics: Capsule/cell dynamics Complex Fluids: Suspensions
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 971 , 25 September 2023 , A13
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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Footnotes

†

Present address: Department of Physics and INFN, Tor Vergata University of Rome, Via della Ricerca Scientifica 1, 00133 Rome, Italy.

‡

Present address: Istituto per le Applicazioni del Calcolo, CNR - Via dei Taurini 19, 00185 Rome, Italy.

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