Merging of Soap Bubbles and Why Surfactant Matters
| Autor: | Claus-Dieter Ohl, Qingyun Zeng, Patricia Pfeiffer, Beng Hau Tan |
|---|---|
| Přispěvatelé: | School of Physical and Mathematical Sciences, Singapore-MIT Alliance for Research and Technology |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Coalescence (physics) Soap bubble Materials science Physics and Astronomy (miscellaneous) Fluid Dynamics (physics.flu-dyn) FOS: Physical sciences Fluid Mechanics Physics - Fluid Dynamics 02 engineering and technology Mechanics Condensed Matter - Soft Condensed Matter 021001 nanoscience & nanotechnology 01 natural sciences Instability Soap Bubbles Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Pulmonary surfactant Physics [Science] Dimple 0103 physical sciences Soft Condensed Matter (cond-mat.soft) 0210 nano-technology High acceleration |
| DOI: | 10.48550/arxiv.1911.03175 |
| Popis: | 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. Published version |
| Databáze: | OpenAIRE |
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