understanding the dynamics of soap bubble pinch-off
DESCRIPTION
Understanding the Dynamics of Soap Bubble Pinch-off. Courtney Cromartie, Daniel Lathrop, Sonali Shukla. Inspiration for Project. Soap Film Topology Talk with Keith Moffatt Unfolding a mobius strip Singularities in catenoids. What About a Blown Bubble?. Stages of Pinch-off. - PowerPoint PPT PresentationTRANSCRIPT
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Understanding the Dynamics of Soap Bubble Pinch-off
Courtney Cromartie, Daniel Lathrop, Sonali Shukla
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Inspiration for Project
Soap Film Topology Talk with Keith Moffatt
Unfolding a mobius stripSingularities in catenoids
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What About a Blown Bubble?
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Stages of Pinch-off
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Apparatus Design
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Experimental Set-up
High-speed video camera2,000 fps, 140 x 160 pixel frame
Pressurized AirDesigned a valve system to control the delivery of air to the nozzle
External Triggering DeviceProvided precision control timing of camera and air burst
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Optimizing Bubble Dynamics
Soap Solution60 ml distilled water, 10 ml Dawn
dishwashing liquid, 3 ml glycerol
Careful balance of pressure and air burst length to produce:
SymmetricSingle-pinch off eventsConsistently
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Edge Tracing & Image Analysis
z - z0 = (internal wall location) – (location of internal collapse)
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Controlling Forces
Proposed that surface tension and kinetic energy of fluid control the process of pinch-off
Dimensional Analysis of force equality uncovers a 2/3’s power law between length and time.
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Preliminary Results from 10 Events
Later Stages of Collapse
Early Stages of Collapse
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Closing Thoughts
Kinetic Energy and Surface Tension likely play a role in the early stages of pinch-off
A camera with a higher frame rate and better resolution would yield more definitive results close to pinch-off
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Special Thanks To:
Daniel Lathrop & Sonali ShuklaUMD TREND ProgramNational Science Foundation