Introduction

Experimental

Setup Photographs

Sample Movies 1

Sample Movies 2

Slug flow levitation

The sample movies below help show the effect sound waves can have on an air bubble in water. In both movies a bubble of 0.14 mL volume is injected into the polyacrylate column which is being vibrated at a frequency of 100 Hz and an amplitude of 0.124 mm zero-to-peak.

In Movie 1, the bubble is injected at a height 0.5 m from the base of the tube and rises upward till the forces acting on it cancel each other out, causing the bubble to be trapped in the liquid.

In Movie 2, the bubble is injected at a height 0.7m from the base of the tube. In this case, it travels downwards till it reaches a point where the forces acting on it cancel out leaving it trapped. The equilibrium points of the bubbles in movies one and two are exactly the same, 0.63 m from the base of the tube.

Movie 1: Bubble rises Recorded at 750 fps Playback is 25 time slower than real time Download Movie 1 (10 MB)	Movie 2: Bubble descends Recorded at 750 fps Playback is 25 times slower than real time Download Movie 2 (7 MB)

The movies above are animated GIF previews. Feel free to download them and view them in real-time. All downloadable movies on this webpage play back at the real-time rate of 30 frames per second (fps).