Flow rule of dense granular flows down a rough incline

T. Börzsönyi, Robert E. Ecke

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

We present experimental findings on the flow rule for granular flows on a rough inclined plane using various materials, including sand and glass beads of various sizes and four types of copper particles with different shapes. We characterize the materials by measuring hs (the thickness at which the flow subsides) as a function of the plane inclination Î on various surfaces. Measuring the surface velocity u of the flow as a function of flow thickness h, we find that for sand and glass beads the Pouliquen flow rule uâ • gh â Îhâ• hs provides reasonable but not perfect collapse of the u (h) curves measured for various Î and mean particle diameter d. Improved collapse is obtained for sand and glass beads by using a recently proposed scaling of the form uâ• gh =Îh tan2 Î â• hs tan2 Î 1 where Î 1 is the angle at which the hs (Î ) curves diverge. Measuring the slope Î for ten different sizes of sand and glass beads, we find a systematic, strong increase of Î with the divergence angle Î 1 of hs. Copper materials with different shapes are not well described by either flow rule with uâ h3â•2.

Original languageEnglish
Article number031301
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume76
Issue number3
DOIs
Publication statusPublished - Sep 4 2007

Fingerprint

Granular Flow
Rough
beads
sands
glass
Copper
Angle
Curve
copper
Inclination
Inclined
Diverge
curves
Divergence
Slope
inclination
Scaling
divergence
slopes
Glass

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Condensed Matter Physics
  • Statistical and Nonlinear Physics
  • Mathematical Physics

Cite this

Flow rule of dense granular flows down a rough incline. / Börzsönyi, T.; Ecke, Robert E.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 76, No. 3, 031301, 04.09.2007.

Research output: Contribution to journalArticle

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