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Liquid acrobatics

File(s)
Bird_DFD2008_mpeg1.mpg (10.72 MB)
Bird_DFDvideo_mpeg1
Bird_DFD2008_mpeg2.mpg (69.1 MB)
Bird_DFDvideo_mpeg2
Permanent Link(s)
https://hdl.handle.net/1813/11469
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Fluid Dynamics Videos
Author
Bird, James
Stone, Howard
Abstract

We experiment with injecting a continuous stream of gas into a shallow liquid, similar to how one might blow into a straw placed at the bottom of a near-empty drink. By varying the angle of the straw (here a metal needle), we observe a variety of dynamics, which we film using a high-speed camera. Most noteworthy is an intermediate regime in which cyclical jets erupt from the air-liquid interface and breakup into air-born droplets. These droplets trace out a parabolic trajectory and bounce on the air-liquid interface before eventually coalescing. The shape of each jet, as well as the time between jets, is remarkably similar and leads to droplets with nearly identical trajectories.

Date Issued
2008-10-09T12:20:47Z
Keywords
Capillarity
•
Drops and bubbles

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