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

Guglietta F, Pelusi F, Sega M, Aouane O, Harting J (2023)

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Publication Type: Journal article

Publication year: 2023

Journal

Book Volume: 971

Article Number: A13

DOI: 10.1017/jfm.2023.694

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.

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How to cite

APA:

Guglietta, F., Pelusi, F., Sega, M., Aouane, O., & Harting, J. (2023). Suspensions of viscoelastic capsules: Effect of membrane viscosity on transient dynamics. Journal of Fluid Mechanics, 971. https://dx.doi.org/10.1017/jfm.2023.694

MLA:

Guglietta, Fabio, et al. "Suspensions of viscoelastic capsules: Effect of membrane viscosity on transient dynamics." Journal of Fluid Mechanics 971 (2023).

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