Nonlinear Physics Lab


 

Internal Imaging of Sheared Dense Granular Material

----- JC Tsai & G.Voth

 

 

 

 

 

 

 

 

 

 

 

 

 

* Main features for internal imaging: Refraction-index-matched fluid + Fluoresent dye in fluid + Laser sheet illumination

Photographs: [ Overview 1 ] [ Main part: annular shear cell ] [ Overview 2 ]

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DISSERTATION by JC Tsai (Dept. of Physics, Univ. of Pennsylvania, 2004):

EVOLUTION and INTERNAL DYNAMICS of QUASI-STATICALLY SHEARED GRANULAR FLOWS (List of contents & PDF files of all sections)

* [MPEG movies] Shear-induced Crystallization & Compaction Steps

* [MPEG movies] Zoom-in images of internal grain motion in the disordered state (2.6Mb) ; images with a higher frame rate (1.3Mb)

* [MPEG movies] Shear-induced Size-segregation of Binary Mixture (Backlit Imaging) (2.5Mb)

* [MPEG movies] Shear-induced Size-segregation of Binary Mixture (Internal Imaging) (2.5Mb)

 

PUBLICATIONS:

* The evolution of internal structure of the quasi-statically sheared packing is described in a paper titled "Slowly Sheared Dense Granluar Flows (I): crystallization and non-unique final states" published as Phys. Rev. E 70, 031303 (September, 2004) [879kb]

* Some early results were published partly in Phys. Rev. Lett. 91, 064301 (August 8, 2003) , preprint [PDF 1.3Mb]

 

* A brief description [~1.1Mb, PDF, 2 pages] accepted by 21st International Congress of Theoretical and Applied Mechanics (ICTAM) : August 2004, Warsaw, Poland.

 

* APS 2004 March (Montreal): Invited Talk, presentation file [~4MB, PPT]

* video for Gallery of Fluid Motion, DFD 2002: [full-size 20MB] [short-version 9.9MB] [preview 331kB]

 

Additional info:

#: MPEG movies can be viewed with IrfanView (providing adjustable playing speeds) ; Windows Media Player