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Related Experiment Videos

Scaling and instabilities in bubble pinch-off.

J C Burton1, R Waldrep, P Taborek

  • 1Department of Physics and Astronomy, University of California, Irvine, CA 92697, USA.

Physical Review Letters
|May 21, 2005
PubMed
Summary

We studied nitrogen gas bubble pinch-off in fluids of varying viscosity. Highly viscous fluids show smooth bubble neck shrinkage, while low viscosity fluids exhibit instability and rupture, forming micron-sized bubbles.

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Area of Science:

  • Fluid dynamics
  • Rheology
  • Bubble dynamics

Background:

  • Understanding bubble dynamics is crucial in various industrial processes.
  • The pinch-off mechanism of gas bubbles is influenced by fluid properties, particularly viscosity.

Purpose of the Study:

  • To investigate the pinch-off dynamics of nitrogen gas bubbles in fluids with a broad range of viscosities.
  • To characterize the relationship between fluid viscosity and bubble neck rupture behavior.

Main Methods:

  • High-speed video analysis at 100,000 frames per second.
  • Systematic variation of external fluid viscosity.

Main Results:

  • In highly viscous fluids (>100 cP), bubble neck radius decreases smoothly, proportional to time before break (tau).
  • In low viscosity fluids (<10 cP), radius scales as tau(1/2) until instability causes rupture.
  • Intermediate viscosities lead to an elongated thread that breaks into micron-sized bubbles.

Conclusions:

  • Fluid viscosity dictates the dominant mechanism of gas bubble pinch-off.
  • The study reveals distinct regimes of bubble neck evolution based on external fluid viscosity.
  • Findings contribute to the understanding of multiphase flow and droplet/bubble formation.

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