Universal non-monotonic drainage in large bare viscous bubbles

Casey Bartlett, Alexandros T. Oratis, Matthieu Santin and James C. Bird ()
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Casey Bartlett: Boston University
Alexandros T. Oratis: Boston University
Matthieu Santin: Boston University
James C. Bird: Boston University

Nature Communications, 2023, vol. 14, issue 1, 1-7

Abstract: Abstract Bubbles will rest at the surface of a liquid bath until their spherical cap drains sufficiently to spontaneously rupture. For large film caps, the memory of initial conditions is believed to be erased due to a visco-gravitational flow, whose velocity increases from the top of the bubble to its base. Consequently, the film thickness has been calculated to be relatively uniform as it thins, regardless of whether the drainage is regulated by shear or elongation. Here, we demonstrate that for large bare bubbles, the film thickness is highly nonuniform throughout drainage, spanning orders of magnitude from top to base. We link the film thickness profile to a universal non-monotonic drainage flow that depends on the bubble thinning rate. These results highlight an unexpected coupling between drainage velocity and bubble thickness profiles and provide critical insight needed to understand the retraction and breakup dynamics of these bubbles upon rupture.

Date: 2023
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DOI: 10.1038/s41467-023-36397-0

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