From site: jurgen.physics.utoronto.ca
           under /pub 


              S P I R A L   D E F E C T   C H A O S
              =====================================

A collection of experimental data and movies of the spiral defect chaos state in Rayleigh-Benard convection of pressurized CO2 in a circular cell.

         by

Stephen W. Morris[*], Eberhard Bodenschatz[+], David S. Cannell[&] and Guenter Ahlers[&].

  
[*] Dept of physics, University of Toronto,
60 St. George St. Toronto, Ontario Canada M5S 1A7
phone (416) 978-6810  
smorris@jurgen.physics.utoronto.ca

[+] Laboratory of Atomic and Solid State Physics, 
Cornell University, Cornell New York, 14853.
phone: (607) 255-0794
eberhard@max.msc.cornell.edu

[&] Department of Physics and Center for Nonlinear Science, 
University of California, Santa Barbara, CA, 93106-9530
phone (805) 893-3150  and  (815) 893-3795
david@walrus.ucsb.edu  and   guenter@tweedledum.ucsb.edu

This experiment was done at U.C. Santa Barbara, and supported by the Department of Energy through Grant DE-FG03-87ER13738.

CONDITIONS:

You are free to use this data in any way you like for nonprofit scientific purposes, provided you acknowledge the authors above and let us know what you find out.  This is only a small sample of the data, more is available if you ask nicely.

The primary reference for this work is:

S. W. Morris, E. Bodenschatz, D. S. Cannell and G. Ahlers, Physical Review Letters, vol. 71, p. 2026, (1993).

The cell was round, with aspect ratio radius/height=78.  The square shadowgraph images were such that the corners of the image just fit inside the circular cell. 

SUMMARY of FILES:

/pub/sp_chaos.mpg

An MPEG compressed movie of spiral defect chaos at epsilon ~ 0.5, Prandtl ~ 1. The experimental conditions were not well known when this movie was made, consequently it must be regarded as "just for show" and not as quantitative data.  The motions are typical of well developed spiral defect chaos.  The entire movie is 200 frames long, with 5 seconds of real time between frames, consequently it lasts approximately 1000 vertical thermal diffusion times. The region shown is the largest square which fit into the circular cell.

/pub/fast_data.tar.gz

A tar file compressed with the GNU zip function gzip.  It contains a directory of 256 images in Tagged Image File Format (TIFF) of shadowgraph data. The file names are in the format fe19_371.*.tiff. Each image is 256 X 256 pixels, with 8-bit grey level.  

The prandtl number was 0.96 and the reduced Rayleigh number (epsilon) was 0.721.  The pictures were taken only 4.6 vertical thermal diffusion times apart, so are highly correlated.  The correlation time is about 14 vertical thermal diffusion times.  The whole data set covers 1174 vertical thermal diffusion times, or about 85 correlation times.

/pub/slow_data.tar.gz

Same conditions as above, except that the time between pictures was increased to about 270 vertical thermal diffusion times, so that they are nearly uncorrelated.  The file names are in the format fe19_37.*.tiff.

S. Morris