Foam coarsening under a steady shear: interplay between bubble rearrangement and film thinning dynamics.

ABSTRACT: Aqueous foams are unstable and age by drainage and coarsening. Today, these effects are well described, as also their impact on foam properties. In that respect, the foam viscoelastic properties evolve in time as a consequence of coarsening which tends to increase the mean bubble size. Here, we investigate the reverse coupling, and study if and how the continuous flow of a foam can impact its dynamics of coarsening. We introduce a new protocol where brief oscillatory measurements are inserted during a constant steady shear, allowing us to monitor the relative variation of the bubble size with time (obtained from the one of the elastic modulus G') as a function of the applied shear rate. It turns out that the coarsening rate is strongly impacted by the applied shear: this rate is con

SUBMITTER: Saint-Jalmes A 

PROVIDER: S-EPMC10015626 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature