Rao, SJ and Jain, S and Basu, S (2024) Dynamics of soap bubble inflation. In: Physical Review Fluids, 9 (5).
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Abstract
Bubbles have always captivated our curiosity with their aesthetics and complexities alike. While the act of blowing bubbles is familiar to everyone, the underlying physics of these fleeting spheres often eludes reasoning. In this Letter, we discuss the dynamics of inflating a soap bubble using controlled airflow through a film-coated nozzle. We assess and predict the rate of inflation by varying the source pressure. Visualizing the previously unexplored internal flow reveals that air enters the bubble as a round jet, emerging from the nozzle opening and impinges on the expanding concave bubble interface to form a toroidal vortex. Several scaling laws of the associated vortical flow spanning the entire bubble and the vortex core are reported. The observed dynamics of this bubble-confined vortex ring formation indicate universality in certain aspects when compared to the free laminar vortex rings. © 2024 American Physical Society.
| Item Type: | Journal Article |
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| Publication: | Physical Review Fluids |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to authors. |
| Keywords: | Phase interfaces; Vortex flow, Bubble interfaces; Internal flows; Ring formation; Round jets; Soap bubbles; Source pressure; Toroidal vortices; Vortex cores; Vortex rings; Vortical flows, Nozzles |
| Department/Centre: | Division of Mechanical Sciences > Mechanical Engineering Others |
| Date Deposited: | 19 Aug 2024 07:21 |
| Last Modified: | 19 Aug 2024 07:21 |
| URI: | http://eprints.iisc.ac.in/id/eprint/85469 |
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