High-speed camera tracks rupture and clustering in free fall granular streams

From paper John R. Royer, Daniel J. Evans, Loreto Oyarte, Qiti Guo, Eliot Kapit, Matthias E. Möbius, Scott R. Waitukaitis & Heinrich M. Jaeger, "High-speed tracking of rupture and clustering in freely falling granular streams,"Nature 459, 1110-1113 (25 June 2009) | doi:10.1038/nature08115.

Stream of glass grains of diameter d = 107 microm. +/- 19 microm. falling out of a nozzle of diameter D0 = 4.0 mm at the following points recorded by a high-speed camera (Phantom v7.1) falling along a low-friction rail outside of the chamber to track a 3-cm-long section of the stream as it falls from the nozzle to the bottom of the chamber (0.04 mm per pixel, 1,000 frames per second. An optical encoder measures the position of the camera, allowing us to correct for small deviations from free-fall as the camera moves along the rail.

Category:

Science & Technology

Tags:

• high-speed movie
• sand grain

[QIQrrr]

Great stuff!