Phys. Rev. Lett. 80, 2833–2836 (1998)4/3 Law of Granular Particles Flowing through a Vertical PipeReceived 16 June 1997; published in the issue dated 30 March 1998 Density waves of granular material (sand) flowing through a vertical pipe have been investigated. Clear density waves emerge when the cock attached to the bottom end of the pipe is closed. The FFT power spectra were found to show a stable power-law form P(f)∼f-α. The value of the exponent was evaluated as α≅4/3. We also introduce a simple one-dimensional model which reproduces α = 4/3 from both simulation and theoretical analysis. © 1998 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.80.2833
DOI:
10.1103/PhysRevLett.80.2833
PACS:
46.10.+z, 05.20.Dd, 05.70.Jk, 81.05.Rm
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