Velocity Distributions and Density Fluctuations
in a 2D Granular Gas.

This is a composite high speed image.
Diffuse light reflects off of about a third of the surface area on the top of each particle.
A number of images taken at 838 fps are overlaid to produce the mpeg frames below.
Slow moving particles overlap, producing high pixel intensities that are false-colored blue.
Fast moving particles do not overlap, producing low pixel intensities that are false-colored red.
The mpegs demonstrate the temperature and density fluctuations discussed in our paper.

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MOVIES!!!!!!!!

Each of the following MPEGs are generated from 1 second
of high speed video and slowed down by a factor of 30.

Here are MPEGs for the free, quasi-2D granular gas:

• Gamma = 0.83
• Gamma = 3.00

Here are MPEGs for the constrained, quasi-2D granular gas:

• Gamma = 0.83
• Gamma = 3.00

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Granular Dynamics Research

Comments, questions and other feedback are welcome: granular@physics.georgetown.edu

last update: April 21, 1999