Coarsening transitions of wet liquid foams under microgravity conditions.
Soft Matter
; 19(33): 6267-6279, 2023 Aug 23.
Article
em En
| MEDLINE
| ID: mdl-37551883
ABSTRACT
We report foam coarsening studies which were performed in the International Space Station (ISS) to suppress drainage due to gravity. Foams and bubbly liquids with controlled liquid fractions Ï between 15 and 50% were investigated to study the transition between bubble growth laws previously reported near the dry limit Ï â 0 and the dilute limit Ï â 1 (Ostwald ripening). We determined the coarsening rates for the driest foams and the bubbly liquids, they are in close agreement with theoretical predictions. We observe a sharp cross-over between the respective laws at a critical value Ï*. At liquid fractions beyond this transition, neighboring bubbles are no longer all in contact, like at a jamming transition. Remarkably Ï* is significantly larger than the random close packing volume fraction of the bubbles Ïrcp which was determined independently. We attribute the differences between Ï* and Ïrcp to a weakly adhesive bubble interaction that we have studied in complementary ground-based experiments.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Tipo de estudo:
Clinical_trials
Idioma:
En
Ano de publicação:
2023
Tipo de documento:
Article