Download presentation
Presentation is loading. Please wait.
Published byJustice Brundrett Modified over 9 years ago
1
Understanding the Dynamics of Soap Bubble Pinch-off Courtney Cromartie, Daniel Lathrop, Sonali Shukla
2
Inspiration for Project Soap Film Topology Talk with Keith Moffatt Unfolding a mobius strip Singularities in catenoids
3
What About a Blown Bubble?
4
Stages of Pinch-off
5
Apparatus Design
6
Experimental Set-up High-speed video camera 2,000 fps, 140 x 160 pixel frame Pressurized Air Designed a valve system to control the delivery of air to the nozzle External Triggering Device Provided precision control timing of camera and air burst
7
Optimizing Bubble Dynamics Soap Solution 60 ml distilled water, 10 ml Dawn dishwashing liquid, 3 ml glycerol Careful balance of pressure and air burst length to produce: Symmetric Single-pinch off events Consistently
9
Edge Tracing & Image Analysis z - z0 = (internal wall location) – (location of internal collapse)
10
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.
11
Preliminary Results from 10 Events Later Stages of Collapse Early Stages of Collapse
12
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
13
Special Thanks To: Daniel Lathrop & Sonali Shukla UMD TREND Program National Science Foundation
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.