Issue 35, 2023

Rheology of a 2D granular film

Abstract

We study experimentally the rheology of a macroscopic particle-laden soap film, designated as a “Granular Film”, in the simple shear configuration. Macroscopic particles are dispersed in a soap film, while being large enough that they bridge both fluid interfaces. We simultaneously perform macroscopic rheological measurements with a classical rheometer and investigate interactions at the particle scale with a camera underneath the film. The determination of the velocity field of the grains reveals the presence of an inhomogeneous shear within the granular film. Trying to correlate both measurements unveils the non-locality of the rheology of the granular film: similar to what has been observed in a dry granular material, we find an highly-sheared zone close to the moving wall contrasting with a large quasistatic area. This behavior can be accounted for through extended kinetic theory and correlated with a transition in the dominant component of the stress.

Graphical abstract: Rheology of a 2D granular film

Article information

Article type
Paper
Submitted
10 Apr 2023
Accepted
09 Aug 2023
First published
16 Aug 2023
This article is Open Access
Creative Commons BY license

Soft Matter, 2023,19, 6838-6843

Rheology of a 2D granular film

J. Lalieu, A. Seguin and G. Gauthier, Soft Matter, 2023, 19, 6838 DOI: 10.1039/D3SM00472D

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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