Comptes Rendus
no. 3
Particle size and boundary geometry effects on the bulk friction coefficient of sheared granular materials in the inertial regime
Andrés D. Orlando1  ; Hayley H. Shen2
1 Jenike & Johanson, Inc., 400 Business Park Drive, Tyngsboro, MA 01879, USA
2 Department of Civil and Environmental Engineering, Clarkson University, 8 Clarkson Ave., P.O. Box 5710, Potsdam, NY 13699-5710, USA
Comptes Rendus. Mécanique, Volume 342 (2014) no. 3, pp. 151-155.

Glass beads of varying diameters (d=2,3,4, and 5 mm) are used to measure the ratio of shear-to-normal stress, or bulk friction coefficient, generated inside an annular shear cell at high shearing rates. The effects of the particle size, the solids concentration, and the shear rate are explored. It is found that (1) for a given particle size, the magnitude of the bulk friction coefficient decreases with increasing solids concentration, (2) for a given solids concentration, the bulk friction coefficient decreases with increasing particle size, and (3) the bulk friction coefficient is independent of the shear rate except for cases with low solids concentration, where it decreases with increasing shear rate. The boundary geometry is found to affect bulk friction only for dilute (low solids concentration) flows involving small particles.

Publié le :
DOI : 10.1016/j.crme.2014.01.009
Mots clés : Granular, Shear, Bulk friction, Size, Boundary effect
Andrés D. Orlando 1 ; Hayley H. Shen 2

1 Jenike & Johanson, Inc., 400 Business Park Drive, Tyngsboro, MA 01879, USA
2 Department of Civil and Environmental Engineering, Clarkson University, 8 Clarkson Ave., P.O. Box 5710, Potsdam, NY 13699-5710, USA 
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Andrés D. Orlando; Hayley H. Shen. Particle size and boundary geometry effects on the bulk friction coefficient of sheared granular materials in the inertial regime. Comptes Rendus. Mécanique, Volume 342 (2014) no. 3, pp. 151-155. doi : 10.1016/j.crme.2014.01.009. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.01.009/

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[2] R.A. Bagnold Experiments on a gravity-free dispersion of large solid spheres in a Newtonian fluid under shear, Proc. R. Soc. Lond. Ser. A, Math. Phys. Sci., Volume 225 (1954) no. 1160, pp. 49-63

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[4] D.M. Hanes; D.L. Inman Observations of rapidly flowing granular-fluid materials, J. Fluid Mech., Volume 150 (1985), pp. 357-380

[5] A.D. Orlando; H.H. Shen Effect of particle size and boundary conditions on the measured shear stress in an annular shear cell, Granul. Matter, Volume 14 (2012) no. 3, pp. 423-431

[6] S.B. Savage; M. Sayed Stresses developed by dry cohesionless granular materials sheared in an annular shear cell, J. Fluid Mech., Volume 142 (1984), pp. 391-430

[7] A.D. Orlando; H.H. Shen Using the annular shear cell as a rheometer for rapidly sheared granular materials – a DEM study, Granul. Matter, Volume 15 (2013) no. 2, pp. 183-194

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