Self-similarity of bubble size distributions in the aging metastable foams

Zimnyakov, Dmitry A.; Zemlyanukhin, A. I.; Yuvchenko, S. A.; Бочкарев, А. В.; Slavnetskov, I. O.; Gavrilov, Sergey; Tumachev, Daniil

doi:10.1016/j.physd.2019.03.008

Cited by 2 publications

(2 citation statements)

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“…Up to now, such an excess of small bubbles has not been reported in the literature ( 21 , 25 , 27 , 29 ). In order to check whether distributions with an excess of small bubbles are also found in drier foams, we have performed coarsening experiments using the same surfactant and a liquid fraction of

, low enough for gravity effects to be compensated in a ground-based experiment by rotating the cell around a horizontal axis (clinostat).…”

Section: Resultsmentioning

confidence: 78%

“…Another important feature of coarsening is the shape of the bubble size distribution that is also expected to change with liquid fraction. Several experimental and numerical works ( 21 , 25 – 29 ) show that the normalized distribution is asymmetric, of the Weibull or lognormal type, in the regime associated with the

growth law, whereas for the

regime, it is more symmetric and narrower ( 13 ).…”

mentioning

confidence: 99%

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Hierarchical bubble size distributions in coarsening wet liquid foams

Galvani,

Pasquet,

Mukherjee

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Coarsening of two-phase systems is crucial for the stability of dense particle packings such as alloys, foams, emulsions, or supersaturated solutions. Mean field theories predict an asymptotic scaling state with a broad particle size distribution. Aqueous foams are good model systems for investigations of coarsening-induced structures, because the continuous liquid as well as the dispersed gas phases are uniform and isotropic. We present coarsening experiments on wet foams, with liquid fractions up to their unjamming point and beyond, that are performed under microgravity to avoid gravitational drainage. As time elapses, a self-similar regime is reached where the normalized bubble size distribution is invariant. Unexpectedly, the distribution features an excess of small roaming bubbles, mobile within the network of jammed larger bubbles. These roaming bubbles are reminiscent of rattlers in granular materials (grains not subjected to contact forces). We identify a critical liquid fraction ϕ ∗ , above which the bubble assembly unjams and the two bubble populations merge into a single narrow distribution of bubbly liquids. Unexpectedly, ϕ ∗ is larger than the random close packing fraction of the foam ϕ rcp . This is because, between ϕ rcp and ϕ ∗ , the large bubbles remain connected due to a weak adhesion between bubbles. We present models that identify the physical mechanisms explaining our observations. We propose a new comprehensive view of the coarsening phenomenon in wet foams. Our results should be applicable to other phase-separating systems and they may also help to control the elaboration of solid foams with hierarchical structures.

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, low enough for gravity effects to be compensated in a ground-based experiment by rotating the cell around a horizontal axis (clinostat).…”

Section: Resultsmentioning

confidence: 78%