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IMAGE: An initial crack in a film creates a RVPB (a). A second crack event in the film (b) causes a "collapse front " to be formed which sweeps up the RVPB...
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Credit: Tokyo Metropolitan University
Tokyo, Japan - Researchers from Tokyo Metropolitan University have revealed how liquid foams collapse by observing individual collapse "events" with high-speed video microscopy. They found that cracks in films led to a receding liquid front which sweeps up the original film border, inverts its shape, and releases a droplet which hits and breaks other films. Their observations and physical model provide key insights into how to make foams more or less resistant to collapse.