Example: Shaken Cornstarch Patterns

Below is a sample “video hunt” entry which illustrates a few main themes of the seminar.  A few things to note:

  • Each entry should have a descriptive title and be marked with the appropriate “Media Hunt #X” category.
  • Each entry is created from the same WordPress account name so that you receive credit for your work.
  • The text below contains information about the source of the video, what the video depicts,  and what relation the video has to the seminar. Entries should be a minimum of a paragraph in length, but a great video may deserve more discussion!
  • A very interesting still image can be used in place of a video.
  • You can use the “Add  Image” button above to make an image appear within your entry. For images already present online, you just need to copy the URL.

In addition, please feel free to comment on each other’s entries using the “Comment” button.

Some sources for videos/images:

Sample entry

This movie created by Robert Deegan shows the dynamics of container of a cornstarch-water mixture being vibrated at various frequencies. Initally, the mixture behaves like a liquid. However, once energy is injected into the system through vibrations, complicated patterns develop. While these patterns appear spatially and temporally chaotic, there is also a large degree of order in the system: the spacing between the stripes is quite constant.

Remarkably, if the surface is disturbed by a puff of air, a permanent hole in the fluid can develop. If the mixture is very strongly shaken, this initial hole can become unstable and develop tall protrusions. This is an example of a small disturbance growing into a much bigger effect, a common phenomenon in nonlinear and nonequilibrium systems.

There is also a Humorous Remix available on YouTube which is fun to watch.

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