Issue 11, 2022

Pinch-off from a foam droplet in a Hele-Shaw cell

Abstract

Placing some foam on a vertical surface is a ubiquitous situation, for example, such as in shaving and wall cleaning in daily life, and in egg-laying or making foam nests for some animals or insects in nature. In such a situation, one may prefer that the foam remains in the initial position. Moreover, losing solution via liquid pinch-off from the bottom of the foam is undesirable. To address the pinching off condition and mechanism, we conducted a model experiment: we confined an amount of foam in a Hele-Shaw cell. Two sliding down modes, both with and without liquid pinch-off, were observed under gravity. We fabricated morphology phase diagrams, and theoretically clarified the onset of liquid pinch-off from a foamy droplet.

Graphical abstract: Pinch-off from a foam droplet in a Hele-Shaw cell

Supplementary files

Article information

Article type
Paper
Submitted
02 Sep 2021
Accepted
07 Feb 2022
First published
22 Feb 2022
This article is Open Access
Creative Commons BY license

Soft Matter, 2022,18, 2137-2142

Pinch-off from a foam droplet in a Hele-Shaw cell

M. Tani and R. Kurita, Soft Matter, 2022, 18, 2137 DOI: 10.1039/D1SM01268A

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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