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
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 stripSingularities in catenoids
What About a Blown Bubble?
Stages of Pinch-off
Apparatus Design
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
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
Edge Tracing & Image Analysis
z - z0 = (internal wall location) – (location of internal collapse)
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.
Preliminary Results from 10 Events
Later Stages of Collapse
Early Stages of Collapse
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
Special Thanks To:
Daniel Lathrop & Sonali ShuklaUMD TREND ProgramNational Science Foundation