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Large bubbles exhibit a highly nonuniform film thickness during drainage, contrary to previous assumptions. This study reveals a universal, non-monotonic flow governing bubble thinning and rupture dynamics.

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Area of Science:

  • Fluid dynamics
  • Surface science
  • Soft matter physics

Background:

  • Bubbles at liquid surfaces drain until spontaneous rupture.
  • Previous models assumed uniform film thickness due to visco-gravitational flow, erasing initial conditions.
  • Drainage was thought to be uniform regardless of shear or elongation.

Purpose of the Study:

  • To investigate the film thickness profile of large bare bubbles during drainage.
  • To identify the flow dynamics governing bubble thinning and rupture.
  • To challenge the existing understanding of bubble drainage and rupture.

Main Methods:

  • Experimental observation of large bare bubble drainage.
  • Analysis of film thickness profiles.
  • Characterization of non-monotonic drainage flow.

Main Results:

  • Demonstrated highly nonuniform film thickness in large bare bubbles, spanning orders of magnitude.
  • Identified a universal non-monotonic drainage flow dependent on bubble thinning rate.
  • Revealed an unexpected coupling between drainage velocity and bubble thickness profiles.

Conclusions:

  • The assumption of uniform film thickness in bubble drainage is incorrect.
  • Bubble thinning and rupture dynamics are governed by a complex, non-monotonic flow.
  • Findings provide critical insights into bubble retraction and breakup mechanisms.