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Title: Merging of soap bubbles and why surfactant matters
Authors: Pfeiffer, Patricia
Zeng, Qingyun
Tan, Beng Hau
Ohl, Claus-Dieter
Keywords: Science::Physics
Issue Date: 2020
Source: Pfeiffer, P., Zeng, Q., Tan, B. H., & Ohl, C.-D. (2020). Merging of soap bubbles and why surfactant matters. Applied Physics Letters, 116(10), 103702-. doi:10.1063/1.5135764
Journal: Applied Physics Letters
Abstract: The merging of two soap bubbles is a fundamental fluid mechanical process in foam formation. In the present experimental study, the liquid films from two soap bubbles are brought together. Once the liquid layers initially separated by a gas sheet are bridged on a single spot, the rapid merging of the two liquid films proceeds. Thereby, the connecting rim is rapidly accelerated into the separating gas layer. We show that, due to the dimple formation, the velocity is not uniform and the high acceleration initially causes a Rayleigh–Taylor instability of the liquid rim. At later times, the rim heals and takes on a circular shape. However, for sufficiently high concentrations of the surfactant, the unstable rim pinches off microbubbles, resulting in a fractal dendritic structure after coalescence.
ISSN: 0003-6951
DOI: 10.1063/1.5135764
Rights: © 2020 The Author(s). All rights reserved. This paper was published by AIP Publishing in Applied Physics Letters and is made available with permission of The Author(s).
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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