Europhys. Lett.
Volume 76, Number 6, December 2006
Page(s) 1095 - 1101
Section Electromagnetism, optics, acoustics, heat transfer, classical mechanics, and fluid dynamics
Published online 16 November 2006
Europhys. Lett., 76 (6), pp. 1095-1101 (2006)
DOI: 10.1209/epl/i2006-10376-1

The coordination number of granular cylinders

J. Blouwolff and S. Fraden

Complex Fluids Group, Martin Fisher School of Physics, Brandeis University Waltham, MA 02454 USA

received 16 August 2006; accepted in final form 18 October 2006
published online 16 November 2006

We report the first experimental measurements of the contact number distribution between randomly packed granular right cylinders (rods and disks) as a function of aspect ratio. The average coordination number $\langle z \rangle$ for cylinders varies smoothly with aspect ratio rising from $\langle z \rangle \sim 6$ for aspect ratios close to one to $\langle z \rangle \sim 10$ for large aspect ratio. Additionally, our measurements demonstrate the validity of the random contact model for compacted piles of long granular cylinders.

45.70.-n - Granular systems.

© EDP Sciences 2006